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Wang J, Ba G, Meng J, Yang S, Tian S, Zhang M, Huang F, Zheng K, Pullerits T, Tian J. Transition Layer Assisted Synthesis of Defect Free Amine-Phosphine Based InP QDs. NANO LETTERS 2024; 24:8894-8901. [PMID: 38990690 DOI: 10.1021/acs.nanolett.4c01648] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 07/13/2024]
Abstract
Environmentally friendly InP-based quantum dots (QDs) are promising for light-emitting diodes (LEDs) and display applications. So far, the synthesis of highly emitting InP-based QDs via safe and economically viable amine-phosphine remains a challenge. Herein, we report the synthesis of amine-phosphine based InP/ZnSe/ZnS QDs by introducing an alloyed oxidation-free In-ZnSe transition layer (TL) at the core-shell interface. The TL not only has the essential function of preventing oxidation of the core and relieving interfacial strain but also results in oriented epitaxial growth of shell. The alloyed TL significantly mitigates the nonradiative recombination at core-shell interfacial trap states, thereby boosting the photoluminescence (PL) efficiency of the QDs up to 98%. Also, the Auger recombination is suppressed, extending the biexciton lifetime from 60 to 100 ps. The electroluminescence device based on the InP-based QDs shows a high external quantum efficiency over 10%, further demonstrating high quality QDs synthesized by this process.
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Affiliation(s)
- Junfeng Wang
- Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, China
| | - Guohang Ba
- Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, China
| | - Jie Meng
- Chemical Physics and Nano, Lund University, Lund 22100, Sweden
| | - Shixu Yang
- Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, China
| | - Shuyu Tian
- Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, China
| | - Mengqi Zhang
- Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, China
| | - Fei Huang
- Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, China
| | - Kaibo Zheng
- Chemical Physics and Nano, Lund University, Lund 22100, Sweden
| | - Tõnu Pullerits
- Chemical Physics and Nano, Lund University, Lund 22100, Sweden
| | - Jianjun Tian
- Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, China
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2
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Xu D, Shen LL, Qin ZK, Yan S, Wang N, Wang J, Gao YJ. Construction of Reverse Type-II InP/Zn xCd 1-xS Core/Shell Quantum Dots with Low Interface Strain to Enhance Photocatalytic Hydrogen Evolution. Inorg Chem 2024; 63:12582-12592. [PMID: 38917407 DOI: 10.1021/acs.inorgchem.4c01503] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/27/2024]
Abstract
The InP-based quantum dots (QDs) have attracted much attention in the field of photocatalytic H2 evolution. However, a shell should be used for InP-based photocatalytic systems to passivate the numerous surface defects. Different from the traditional InP-based core/shell QDs with Type-I or Type-II band alignment, herein, the "reverse Type-II" core/shell QDs in which both the conduction and valence bands of shell materials are more negative than those of core materials have been well-designed by regulating the ratio of Cd/Zn of the alloyed ZnxCd1-xS shell. The reverse Type-II band alignment would realize the spatial separation of photogenerated carriers. More importantly, the photogenerated holes tend to rest on the shell in the reverse Type-II QDs, which facilitate hole transfer to the surface, the rate-determining step for solar H2 evolution using QDs. Therefore, the obtained InP/Zn0.25Cd0.75S core/shell QDs exhibit superior photocatalytic activity and stability under visible light irradiation. The rate of solar H2 evolution reaches 376.19 μmol h-1 mg-1 at the initial 46 h, with a turnover number of ∼2,157,000 per QD within 70 h irradiation.
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Affiliation(s)
- Dongzi Xu
- School of Chemistry and Chemical Engineering, Faculty of Chemistry and Pharmacy, Qilu University of Technology (Shandong Academy of Science), Jinan 250353, P. R. China
| | - Li-Lei Shen
- School of Chemistry and Chemical Engineering, Faculty of Chemistry and Pharmacy, Qilu University of Technology (Shandong Academy of Science), Jinan 250353, P. R. China
| | - Zhi-Kai Qin
- School of Chemistry and Chemical Engineering, Faculty of Chemistry and Pharmacy, Qilu University of Technology (Shandong Academy of Science), Jinan 250353, P. R. China
| | - Shuo Yan
- School of Chemistry and Chemical Engineering, Faculty of Chemistry and Pharmacy, Qilu University of Technology (Shandong Academy of Science), Jinan 250353, P. R. China
| | - Nianxing Wang
- Department of Mechanical and Materials Engineering, University of Turku, Turku 20014, Finland
| | - Jingui Wang
- School of Chemistry and Chemical Engineering, Faculty of Chemistry and Pharmacy, Qilu University of Technology (Shandong Academy of Science), Jinan 250353, P. R. China
| | - Yu-Ji Gao
- School of Chemistry and Chemical Engineering, Faculty of Chemistry and Pharmacy, Qilu University of Technology (Shandong Academy of Science), Jinan 250353, P. R. China
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3
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Yoo D, Choi MJ. Asymmetric Metal-Carboxylate Complexes for Synthesis of InGaP Alloyed Quantum Dots with Blue Emission. ACS NANO 2024; 18:16051-16058. [PMID: 38840340 DOI: 10.1021/acsnano.4c05643] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2024]
Abstract
Indium phosphide (InP) quantum dots (QDs) have attracted significant interest as next-generation light-emitting materials. However, the synthesis of blue-emitting InP-based QDs has lagged behind that of established green- and red-emitting InP QDs. Herein, we present a strategy to synthesize blue-emitting QDs by forming an InGaP alloy composition. The introduction of asymmetric In-carboxylate and Ga-carboxylate complexes resulted in a balanced synthetic reactivity between In-P and Ga-P, leading to the formation of InGaP alloyed QDs. The resultant In1-xGaxP alloyed QDs exhibited a broad range of photoluminescence (PL) tunability, spanning from 535 nm (InP) to 465 nm (In0.62Ga0.38P), depending on the In/Ga ratio used in the synthesis. In contrast, synthesis with symmetric In-carboxylate and Ga-carboxylate complexes produced a core/shell structure of InP/GaP QDs, which did not exhibit a blue shift of the PL peak with Ga addition. By employing a core/shell structure of In0.62Ga0.38P/ZnS QDs, we achieved a PL quantum yield of 42% at 475 nm. This work highlights the material-processing strategy essential for forming alloyed structures in III-V ternary systems.
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Affiliation(s)
- Doheon Yoo
- Department of Chemical and Biochemical Engineering, Dongguk University, Pildong-ro 1-gil, Jung-gu, Seoul 04620, Republic of Korea
| | - Min-Jae Choi
- Department of Chemical and Biochemical Engineering, Dongguk University, Pildong-ro 1-gil, Jung-gu, Seoul 04620, Republic of Korea
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4
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Kim J, Roh J, Park M, Lee C. Recent Advances and Challenges of Colloidal Quantum Dot Light-Emitting Diodes for Display Applications. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2024; 36:e2212220. [PMID: 36853911 DOI: 10.1002/adma.202212220] [Citation(s) in RCA: 14] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/28/2022] [Revised: 02/21/2023] [Indexed: 06/18/2023]
Abstract
Colloidal quantum dots (QDs) exhibit tremendous potential in display technologies owing to their unique optical properties, such as size-tunable emission wavelength, narrow spectral linewidth, and near-unity photoluminescence quantum yield. Significant efforts in academia and industry have achieved dramatic improvements in the performance of quantum dot light-emitting diodes (QLEDs) over the past decade, primarily owing to the development of high-quality QDs and optimized device architectures. Moreover, sophisticated patterning processes have also been developed for QDs, which is an essential technique for their commercialization. As a result of these achievements, some QD-based display technologies, such as QD enhancement films and QD-organic light-emitting diodes, have been successfully commercialized, confirming the superiority of QDs in display technologies. However, despite these developments, the commercialization of QLEDs is yet to reach a threshold, requiring a leap forward in addressing challenges and related problems. Thus, representative research trends, progress, and challenges of QLEDs in the categories of material synthesis, device engineering, and fabrication method to specify the current status and development direction are reviewed. Furthermore, brief insights into the factors to be considered when conducting research on single-device QLEDs are provided to realize active matrix displays. This review guides the way toward the commercialization of QLEDs.
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Affiliation(s)
- Jaehoon Kim
- Department of Energy and Mineral Resources Engineering, Dong-A University, Busan, 49315, Republic of Korea
| | - Jeongkyun Roh
- Department of Electrical Engineering, Pusan National University, Busan, 46241, Republic of Korea
| | - Myoungjin Park
- Display Research Center, Samsung Display Co., Yongin-si, Gyeonggi-do, 17113, Republic of Korea
| | - Changhee Lee
- Display Research Center, Samsung Display Co., Yongin-si, Gyeonggi-do, 17113, Republic of Korea
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5
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Calvin JJ, Brewer AS, Crook MF, Kaufman TM, Alivisatos AP. Observation of negative surface and interface energies of quantum dots. Proc Natl Acad Sci U S A 2024; 121:e2307633121. [PMID: 38648471 PMCID: PMC11067453 DOI: 10.1073/pnas.2307633121] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2023] [Accepted: 03/21/2024] [Indexed: 04/25/2024] Open
Abstract
Surface energy is a fundamental property of materials and is particularly important in describing nanomaterials where atoms or molecules at the surface constitute a large fraction of the material. Traditionally, surface energy is considered to be a positive quantity, where atoms or molecules at the surface are less thermodynamically stable than their counterparts in the interior of the material because they have fewer bonds or interactions at the surface. Using calorimetric methods, we show that the surface energy is negative in some prototypical colloidal semiconductor nanocrystals, or quantum dots with organic ligand coatings. This implies that the surface atoms are more thermodynamically stable than those on the interior due to the strong bonds between these atoms and surfactant molecules, or ligands, that coat their surface. In addition, we extend this work to core/shell indium phosphide/zinc sulfide nanocrystals and show that the interfacial energy between these materials is highly thermodynamically favorable in spite of their large lattice mismatch. This work challenges many of the assumptions that have guided thinking about colloidal nanomaterial thermodynamics, investigates the fundamental stability of many technologically relevant colloidal nanomaterials, and paves the way for future experimental and theoretical work on nanocrystal thermodynamics.
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Affiliation(s)
- Jason J. Calvin
- Department of Chemistry, University of California, Berkeley, CA94720
- Material Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA94720
| | - Amanda S. Brewer
- Department of Chemistry, University of California, Berkeley, CA94720
- Material Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA94720
| | - Michelle F. Crook
- Department of Chemistry, University of California, Berkeley, CA94720
- Material Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA94720
| | - Tierni M. Kaufman
- Department of Chemistry, University of California, Berkeley, CA94720
| | - A. Paul Alivisatos
- Department of Chemistry, University of California, Berkeley, CA94720
- Material Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA94720
- Department of Materials Science and Engineering, University of California, Berkeley, CA94720
- Kavli Energy NanoScience Institute, University of California, Berkeley, CA94720
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6
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Gordon CK, Nass L, Chan S, Davis NJLK. Micellular fluorescence resonance energy transfer based fluorescent ratiometric response to hydrocarbon analytes. LUMINESCENCE 2023. [PMID: 38114325 DOI: 10.1002/bio.4653] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2023] [Revised: 11/16/2023] [Accepted: 11/24/2023] [Indexed: 12/21/2023]
Abstract
Fluorescence resonance energy transfer (FRET) has been utilised to develop numerous selective and sensitive fluorescent ratiometric sensors. Typically, FRET-based fluorescent ratiometric sensors rely on chemical interactions between the sensor and analyte to illicit a response, thus unreactive hydrocarbons are a neglected analyte and a source for new sensors. By containing an unbound donor-acceptor system within micelles, energy transfer is enabled by spatial confinement. This offers the potential of a ratiometric response as a hydrocarbon analyte is added. Introducing a hydrocarbon analyte to this system causes micelles to swell, increasing the donor-acceptor distance and thus reducing the amount of observed energy transfer. We present InP/ZnS quantum dot donors interacting with a Nile Red acceptor, confined by cetyltrimethylammonium bromide (CTAB)-based micelles. We alleviated spatial confinement of the pair within micelles using common laboratory solvents to represent hydrocarbons, (toluene, hexane and octadecene). We constructed calibration curves for each solvent and found effective sensing ranges of 0.009-0.21, 0.008-0.27 and 0.003-0.06 M for toluene, hexane and octadecene, respectively. This study contributes towards the development of new hydrocarbon sensors utilising this new mechanism.
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Affiliation(s)
- Calum K Gordon
- School of Chemical and Physical Sciences, Victoria University of Wellington, Wellington, New Zealand
- The MacDiarmid Institute for Advanced Materials and Nanotechnology, Victoria University of Wellington, Wellington, New Zealand
- The Dodd-Walls Centre for Photonic and Quantum Technologies, University of Otago, Dunedin, New Zealand
| | - Liselotte Nass
- School of Chemical and Physical Sciences, Victoria University of Wellington, Wellington, New Zealand
- Debye Institute for Nanomaterials Science, Utrecht University, Utrecht, The Netherlands
| | - Sanutep Chan
- School of Chemical and Physical Sciences, Victoria University of Wellington, Wellington, New Zealand
- The MacDiarmid Institute for Advanced Materials and Nanotechnology, Victoria University of Wellington, Wellington, New Zealand
- The Dodd-Walls Centre for Photonic and Quantum Technologies, University of Otago, Dunedin, New Zealand
| | - Nathaniel J L K Davis
- School of Chemical and Physical Sciences, Victoria University of Wellington, Wellington, New Zealand
- The MacDiarmid Institute for Advanced Materials and Nanotechnology, Victoria University of Wellington, Wellington, New Zealand
- The Dodd-Walls Centre for Photonic and Quantum Technologies, University of Otago, Dunedin, New Zealand
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7
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Roy P, Virmani M, Pillai PP. Blue-emitting InP quantum dots participate in an efficient resonance energy transfer process in water. Chem Sci 2023; 14:5167-5176. [PMID: 37206393 PMCID: PMC10189856 DOI: 10.1039/d3sc00164d] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2023] [Accepted: 04/20/2023] [Indexed: 05/21/2023] Open
Abstract
Development of stable blue-emitting materials has always been a challenging task because of the necessity of high crystal quality and good optical properties. We have developed a highly efficient blue-emitter, based on environmentally friendly indium phosphide/zinc sulphide quantum dots (InP/ZnS QDs) in water, by controlling the growth kinetics of the core as well as the shell. A rational combination of less-reactive metal-halides, phosphorus, and sulphur precursors is the key for achieving the uniform growth of the InP core and ZnS shell. The InP/ZnS QDs showed long-term stable photoluminescence (PL) in the pure-blue region (∼462 nm), with an absolute PL quantum yield of ∼50% and a colour purity of ∼80% in water. Cytotoxicity studies revealed that the cells can withstand up to ∼2 micromolar concentration of pure-blue emitting InP/ZnS QDs (∼120 μg mL-1). Multicolour imaging studies show that the PL of InP/ZnS QDs was well-retained inside the cells as well, without interfering with the fluorescence signal of commercially available biomarkers. Moreover, the ability of InP based pure-blue emitters to participate in an efficient Förster resonance energy transfer (FRET) process is demonstrated. Installing a favorable electrostatic interaction turned out to be crucial in achieving an efficient FRET process (E ∼75%) from blue-emitting InP/ZnS QDs to rhodamine B dye (Rh B) in water. The quenching dynamics fits well with the Perrin formalism and the distance-dependent quenching (DDQ) model, which confirms an electrostatically driven multi-layer assembly of Rh B acceptor molecules around the InP/ZnS QD donor. Furthermore, the process of FRET was successfully translated into the solid state, proving their suitability for device-level studies as well. In short, our study expands the spectrum of aqueous QDs based on InP towards the blue region for future biological and light harvesting studies.
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Affiliation(s)
- Pradyut Roy
- Department of Chemistry, Indian Institute of Science Education and Research (Pune) Dr Homi Bhabha Road, Pashan Pune - 411008 India
| | - Mishika Virmani
- Department of Chemistry, Indian Institute of Science Education and Research (Pune) Dr Homi Bhabha Road, Pashan Pune - 411008 India
| | - Pramod P Pillai
- Department of Chemistry, Indian Institute of Science Education and Research (Pune) Dr Homi Bhabha Road, Pashan Pune - 411008 India
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8
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Fan XB, Shin DW, Lee S, Ye J, Yu S, Morgan DJ, Arbab A, Yang J, Jo JW, Kim Y, Jung SM, Davies PR, Rao A, Hou B, Kim JM. InP/ZnS quantum dot photoluminescence modulation via in situ H 2S interface engineering. NANOSCALE HORIZONS 2023; 8:522-529. [PMID: 36790218 DOI: 10.1039/d2nh00436d] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/18/2023]
Abstract
InP quantum dots (QDs) are attracting significant interest as a potentially less toxic alternative to Cd-based QDs in many research areas. Although InP-based core/shell QDs with excellent photoluminescence properties have been reported so far, sophisticated interface treatment to eliminate defects is often necessary. Herein, using aminophosphine as a seeding source of phosphorus, we find that H2S can be efficiently generated from the reaction between a thiol and an alkylamine at high temperatures. Apart from general comprehension that H2S acts as a S precursor, it is revealed that with core etching by H2S, the interface between InP and ZnS can be reconstructed with S2- incorporation. Such a transition layer can reduce inherent defects at the interface, resulting in significant photoluminescence (PL) enhancement. Meanwhile, the size of the InP core could be further controlled by H2S etching, which offers a feasible process to obtain wide band gap InP-based QDs with blue emission.
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Affiliation(s)
- Xiang-Bing Fan
- Department of Engineering, University of Cambridge, Cambridge, CB3 0FA, UK.
| | - Dong-Wook Shin
- Department of Engineering, University of Cambridge, Cambridge, CB3 0FA, UK.
| | - Sanghyo Lee
- Department of Engineering, University of Cambridge, Cambridge, CB3 0FA, UK.
| | - Junzhi Ye
- The Cavendish Laboratory, Department of Physics, University of Cambridge, Cambridge, CB3 0HE, UK
| | - Shan Yu
- School of New Energy and Materials, Southwest Petroleum University, Chengdu, 610500, China
| | - David J Morgan
- School of Chemistry, Cardiff University, Cardiff, CF10 3AT, UK
| | - Adrees Arbab
- Department of Engineering, University of Cambridge, Cambridge, CB3 0FA, UK.
| | - Jiajie Yang
- Department of Engineering, University of Cambridge, Cambridge, CB3 0FA, UK.
| | - Jeong-Wan Jo
- Department of Engineering, University of Cambridge, Cambridge, CB3 0FA, UK.
| | - Yoonwoo Kim
- Department of Engineering, University of Cambridge, Cambridge, CB3 0FA, UK.
| | - Sung-Min Jung
- Department of Engineering, University of Cambridge, Cambridge, CB3 0FA, UK.
| | - Philip R Davies
- School of Chemistry, Cardiff University, Cardiff, CF10 3AT, UK
| | - Akshay Rao
- The Cavendish Laboratory, Department of Physics, University of Cambridge, Cambridge, CB3 0HE, UK
| | - Bo Hou
- School of Physics and Astronomy, Cardiff University, Cardiff, CF24 3AA, UK
| | - Jong Min Kim
- Department of Engineering, University of Cambridge, Cambridge, CB3 0FA, UK.
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Hu HL, Hao H, Ren X, Chen ZY, Liu M, Liu Y, Jiang FL. Bright InP Quantum Dots by Mid-Synthetic Modification with Zinc Halides. Inorg Chem 2023; 62:2877-2886. [PMID: 36723932 DOI: 10.1021/acs.inorgchem.2c04308] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
InP quantum dots (QDs) attract growing interest in recent years, owing to their environmental advantages upon applications in display and lighting. However, compared to Cd-based QDs and Pb-based perovskites, the synthesis of InP QDs with high optical quality is relatively more difficult. Here, we established a mid-synthetic modification approach to improve the optical properties of InP-based QDs. Tris(dimethylamino)phosphine ((DMA)3P) and indium iodide were used to prepare InP QDs with a green emission (∼527 nm). By introducing zinc halides (ZnX2) during the mid-synthetic process, the photoluminescence quantum yield (PLQY) of the resulting InP/ZnSeS/ZnS core/shell/shell QDs was increased to >70%, and the full-width-at-half-maximum (FWHM) could be narrowed to ∼40 nm. Transmission electron microscopy clearly showed the improvement of the QDs particle size distribution after introducing ZnX2. It was speculated that ZnX2 was bound to the surface of QDs as a Z-type ligand, which not only passivated surface defects and suppressed the emission of defect states but also prevented Ostwald ripening. The InP cores were also activated by ZnX2, which made the growth of the ZnSeS shell more favorable. The photoluminescence properties started to be improved significantly only when the amount of ZnX2 exceeded 0.5 mmol. As the amount increased, more ZnX2 was distributed around the QDs to form a ligand layer, which prevented the shell precursor from crossing the ligand layer to the surface of the InP core, thus reducing the size of the InP/ZnSeS/ZnS QDs. This work revealed a new role of ZnX2 and found a method for InP QDs with high brightness and low FWHM by the mid-synthetic modification, which would inspire the synthesis of even better InP QDs.
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Affiliation(s)
- Hui-Ling Hu
- Sauvage Center for Molecular Sciences, College of Chemistry and Molecular Sciences, Wuhan University, Wuhan430072, P. R. China
| | - Hao Hao
- Sauvage Center for Molecular Sciences, College of Chemistry and Molecular Sciences, Wuhan University, Wuhan430072, P. R. China
| | - Xue Ren
- Sauvage Center for Molecular Sciences, College of Chemistry and Molecular Sciences, Wuhan University, Wuhan430072, P. R. China
| | - Zhe-Yong Chen
- Sauvage Center for Molecular Sciences, College of Chemistry and Molecular Sciences, Wuhan University, Wuhan430072, P. R. China
| | - Meng Liu
- Sauvage Center for Molecular Sciences, College of Chemistry and Molecular Sciences, Wuhan University, Wuhan430072, P. R. China
| | - Yi Liu
- Sauvage Center for Molecular Sciences, College of Chemistry and Molecular Sciences, Wuhan University, Wuhan430072, P. R. China.,College of Chemistry and Environmental Engineering, Wuhan Polytechnic University, Wuhan430023, P. R. China
| | - Feng-Lei Jiang
- Sauvage Center for Molecular Sciences, College of Chemistry and Molecular Sciences, Wuhan University, Wuhan430072, P. R. China
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10
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Yoo D, Bak E, Ju HM, Shin YM, Choi MJ. Zinc Carboxylate Surface Passivation for Enhanced Optical Properties of In(Zn)P Colloidal Quantum Dots. MICROMACHINES 2022; 13:mi13101775. [PMID: 36296128 PMCID: PMC9610929 DOI: 10.3390/mi13101775] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/30/2022] [Revised: 10/15/2022] [Accepted: 10/17/2022] [Indexed: 06/01/2023]
Abstract
Indium phosphide (InP) colloidal quantum dots (CQDs) have generated great interest as next-generation light-emitting materials owing to their narrow emission spectra and environment-friendly components. The minimized surface defects is essential to achieve narrow full-width at half-maximum (FWHM) and high photoluminescence quantum yield (PLQY). However, InP CQDs are readily oxidized in ambient condition, which results in formation of oxidation defect states on the surface of InP CQDs. Herein, we introduce a strategy to successfully passivate the surface defects of InP core by zinc complexes. The zinc carboxylates passivation reduces FWHM of InP CQDs from 130 nm to 70 nm and increases PLQY from 1% to 14% without shelling. Furthermore, the photoluminescence (PL) peak has shifted from 670 nm to 510 nm with an increase of zinc carboxylates passivation, which suggests that excessive zinc carboxylates functions as a size-regulating reagent in the synthesis.
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11
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Nayak D, Choudhary RB. Influence of ZnS on the structural, morphological, optical and thermal properties of Polyindole for an emissive layer. INORG CHEM COMMUN 2022. [DOI: 10.1016/j.inoche.2022.109824] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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12
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Hahn RVH, Rodríguez-Bolívar S, Rodosthenous P, Skibinsky-Gitlin ES, Califano M, Gómez-Campos FM. Optical Absorption in N-Dimensional Colloidal Quantum Dot Arrays: Influence of Stoichiometry and Applications in Intermediate Band Solar Cells. NANOMATERIALS (BASEL, SWITZERLAND) 2022; 12:3387. [PMID: 36234515 PMCID: PMC9565355 DOI: 10.3390/nano12193387] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/02/2022] [Revised: 09/21/2022] [Accepted: 09/22/2022] [Indexed: 06/16/2023]
Abstract
We present a theoretical atomistic study of the optical properties of non-toxic InX (X = P, As, Sb) colloidal quantum dot arrays for application in photovoltaics. We focus on the electronic structure and optical absorption and on their dependence on array dimensionality and surface stoichiometry motivated by the rapid development of experimental techniques to achieve high periodicity and colloidal quantum dot characteristics. The homogeneous response of colloidal quantum dot arrays to different light polarizations is also investigated. Our results shed light on the optical behaviour of these novel multi-dimensional nanomaterials and identify some of them as ideal building blocks for intermediate band solar cells.
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Affiliation(s)
- Rebeca V. H. Hahn
- Departamento de Electrónica y Tecnología de los Computadores, Facultad de Ciencias, Universidad de Granada, 18071 Granada, Spain
| | - Salvador Rodríguez-Bolívar
- Departamento de Electrónica y Tecnología de los Computadores, Facultad de Ciencias, Universidad de Granada, 18071 Granada, Spain
| | - Panagiotis Rodosthenous
- Pollard Institute, School of Electronic and Electrical Engineering, University of Leeds, Leeds LS2 9JT, UK
| | - Erik S. Skibinsky-Gitlin
- Departamento de Electrónica y Tecnología de los Computadores, Facultad de Ciencias, Universidad de Granada, 18071 Granada, Spain
| | - Marco Califano
- Pollard Institute, School of Electronic and Electrical Engineering, University of Leeds, Leeds LS2 9JT, UK
| | - Francisco M. Gómez-Campos
- Departamento de Electrónica y Tecnología de los Computadores, Facultad de Ciencias, Universidad de Granada, 18071 Granada, Spain
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