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Yan S. Negative Thermal Quenching of Photoluminescence: An Evaluation from the Macroscopic Viewpoint. MATERIALS (BASEL, SWITZERLAND) 2024; 17:586. [PMID: 38591414 PMCID: PMC10856741 DOI: 10.3390/ma17030586] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/08/2023] [Revised: 01/13/2024] [Accepted: 01/19/2024] [Indexed: 04/10/2024]
Abstract
Negative thermal quenching (NTQ) denotes that the integral emission spectral intensity of a given phosphor increases continuously with increasing temperature up to a certain elevated temperature. NTQ has been the subject of intensive investigations in recent years, and a large number of phosphors are reported to have exhibited NTQ. In this paper, a collection of results in the archival literature about NTQ of specific phosphors is discussed from a macroscopic viewpoint, focusing on the following three aspects: (1) Could the NTQ of a given phosphor be reproducible? (2) Could the associated data for a given phosphor exhibiting NTQ be in line with the law of the conservation of energy? (3) Could the NTQ of a given phosphor be demonstrated in a prototype WLED device? By analyzing typical cases based on common sense, we hope to increase awareness of the issues with papers reporting the NTQ of specific phosphors based on spectral intensity, along with the importance of maintaining stable and consistent measurement conditions in temperature-dependent spectral intensity measurement, which is a prerequisite for the validity of the measurement results.
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Affiliation(s)
- Shirun Yan
- Department of Chemistry, Fudan University, Shanghai 200438, China
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Mushtaq U, Ayoub I, Kumar V, Sharma V, Swart HC, Chamanehpour E, Rubahn HG, Mishra YK. Persistent luminescent nanophosphors for applications in cancer theranostics, biomedical, imaging and security. Mater Today Bio 2023; 23:100860. [PMID: 38179230 PMCID: PMC10765243 DOI: 10.1016/j.mtbio.2023.100860] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2023] [Revised: 10/24/2023] [Accepted: 11/07/2023] [Indexed: 01/06/2024] Open
Abstract
The extraordinary and unique properties of persistent luminescent (PerLum) nanostructures like storage of charge carriers, extended afterglow, and some other fascinating characteristics like no need for in-situ excitation, and rechargeable luminescence make such materials a primary candidate in the fields of bio-imaging and therapeutics. Apart from this, due to their extraordinary properties they have also found their place in the fields of anti-counterfeiting, latent fingerprinting (LPF), luminescent markings, photocatalysis, solid-state lighting devices, glow-in-dark toys, etc. Over the past few years, persistent luminescent nanoparticles (PLNPs) have been extensively used for targeted drug delivery, bio-imaging guided photodynamic and photo-thermal therapy, biosensing for cancer detection and subsequent treatment, latent fingerprinting, and anti-counterfeiting owing to their enhanced charge storage ability, in-vitro excitation, increased duration of time between excitation and emission, low tissue absorption, high signal-to-noise ratio, etc. In this review, we have focused on most of the key aspects related to PLNPs, including the different mechanisms leading to such phenomena, key fabrication techniques, properties of hosts and different activators, emission, and excitation characteristics, and important properties of trap states. This review article focuses on recent advances in cancer theranostics with the help of PLNPs. Recent advances in using PLNPs for anti-counterfeiting and latent fingerprinting are also discussed in this review.
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Affiliation(s)
- Umer Mushtaq
- Department of Physics, National Institute of Technology Srinagar, Jammu and Kashmir, 190006, India
- Department of Physics, University of the Free State, P.O. Box 339, Bloemfontein, ZA9300, South Africa
| | - Irfan Ayoub
- Department of Physics, National Institute of Technology Srinagar, Jammu and Kashmir, 190006, India
- Department of Physics, University of the Free State, P.O. Box 339, Bloemfontein, ZA9300, South Africa
| | - Vijay Kumar
- Department of Physics, National Institute of Technology Srinagar, Jammu and Kashmir, 190006, India
- Department of Physics, University of the Free State, P.O. Box 339, Bloemfontein, ZA9300, South Africa
| | - Vishal Sharma
- Institute of Forensic Science & Criminology, Panjab University, Chandigarh, 160014, India
| | - Hendrik C. Swart
- Department of Physics, University of the Free State, P.O. Box 339, Bloemfontein, ZA9300, South Africa
| | - Elham Chamanehpour
- NanoSYD, Mads Clausen Institute, University of Southern Denmark, Alsion 2, Sønderborg, 6400, Denmark
| | - Horst-Günter Rubahn
- NanoSYD, Mads Clausen Institute, University of Southern Denmark, Alsion 2, Sønderborg, 6400, Denmark
| | - Yogendra Kumar Mishra
- NanoSYD, Mads Clausen Institute, University of Southern Denmark, Alsion 2, Sønderborg, 6400, Denmark
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Wani MA, Athawale SA, Belekar R. Synthesis, characterization, and exploring optical pathways of centrosymmetric Li2MgP2O7/ZnMgP2O7:Eu3+ pyrophosphate phosphor for LEDs applications. J Mol Struct 2023. [DOI: 10.1016/j.molstruc.2023.135466] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/31/2023]
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Chen H, Lei Y, Li J, Chen K, Wu L, Zheng L, Sun T, Kong Y, Zhang Y, Xu J. Intense Luminescence and Good Thermal Stability in a Mn 2+-Activated Mg-Based Phosphor with Self-Reduction. Inorg Chem 2022; 61:5495-5501. [PMID: 35289176 DOI: 10.1021/acs.inorgchem.1c03741] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
White light-emitting diodes provide widespread applications in lighting, electronic equipment, and high-tech displays. However, thermal quenching effect severely limits their practical application. Here, we developed an orange-red phosphor β-KMg(PO3)3:Mn2+, which emits bright orange-red light when excited by ultraviolet light without the energy transfer of sensitizer, owing to the strong crystal field provided by β-KMg(PO3)3 for Mn2+. The self-reduction of Mn4+ → Mn2+ and good thermal stability have been realized in an ambient atmosphere. The defect types were verified by X-ray photoelectron spectroscopy, and cationic vacancy plays a significant role in the self-reduction of Mn4+ → Mn2+. Furthermore, the properties of the trap energy levels were studied by thermoluminescence. The recombination luminescence of the detrapped carriers released from the deep trap levels at high temperatures suppresses the luminescence loss of thermal quenching. Moreover, the trap energy levels play an important role in the mechanoluminescence of β-KMg(PO3)3:Mn2+. This work emphasizes the significance of the defects in the luminescent characteristics and opens up a new approach for the development of advanced optical functional materials.
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Affiliation(s)
- Huimin Chen
- Key Laboratory of Weak-Light Nonlinear Photonics, Ministry of Education, School of Physics, Nankai University, Tianjin 300071, China.,School of Physics and Information Engineering, Shanxi Normal University, Taiyuan 030031, China
| | - Yue Lei
- Key Laboratory of Weak-Light Nonlinear Photonics, Ministry of Education, School of Physics, Nankai University, Tianjin 300071, China
| | - Jiaojiao Li
- Key Laboratory of Weak-Light Nonlinear Photonics, Ministry of Education, School of Physics, Nankai University, Tianjin 300071, China
| | - Kexin Chen
- Key Laboratory of Weak-Light Nonlinear Photonics, Ministry of Education, School of Physics, Nankai University, Tianjin 300071, China
| | - Li Wu
- Key Laboratory of Weak-Light Nonlinear Photonics, Ministry of Education, School of Physics, Nankai University, Tianjin 300071, China
| | - Lirong Zheng
- Multi-Discipline Research Center, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
| | - Tongqing Sun
- Key Laboratory of Weak-Light Nonlinear Photonics, Ministry of Education, School of Physics, Nankai University, Tianjin 300071, China
| | - Yongfa Kong
- Key Laboratory of Weak-Light Nonlinear Photonics, Ministry of Education, School of Physics, Nankai University, Tianjin 300071, China
| | - Yi Zhang
- College of Electronic Information and Optical Engineering and Tianjin Key Laboratory of Photo-electronic Thin Film Devices and Technology, Nankai University, Tianjin 300071, China
| | - Jingjun Xu
- Key Laboratory of Weak-Light Nonlinear Photonics, Ministry of Education, School of Physics, Nankai University, Tianjin 300071, China
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Hariyani S, Brgoch J. Spectral Design of Phosphor-Converted LED Lighting Guided by Color Theory. Inorg Chem 2021; 61:4205-4218. [PMID: 34932351 DOI: 10.1021/acs.inorgchem.1c02975] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
In the race to develop new luminescent materials for the next generation of light-emitting-diode (LED)-based solid-state lighting and display applications, it is often forgotten that color theory and human perception should be some of the principal factors guiding materials design. In this Viewpoint, we explore some of the antiquated colorimetrics established originally for incandescent and fluorescent lighting and discuss how they are still widely applied in the literature today to interpret the color quality of luminescent materials, like inorganic phosphors and quantum dots, and to analyze prototype devices, despite their shortcomings. We then shift our analysis toward contemporary ideas in color theory that more accurately describe the color quality of modern LED light bulbs and flat-panel displays. Finally, the perspective examines the opportunities and challenges of applying these new concepts to guide the design of luminescent materials used in LED-based applications.
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Affiliation(s)
- Shruti Hariyani
- Department of Chemistry and the Texas Center for Superconductivity, University of Houston, Houston, Texas 77204, United States
| | - Jakoah Brgoch
- Department of Chemistry and the Texas Center for Superconductivity, University of Houston, Houston, Texas 77204, United States
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Van Quang N, Thi Huyen N, Tu N, Quang Trung D, Duc Anh D, Tran MT, Hung ND, Viet DX, Huy PT. A high quantum efficiency plant growth LED by using a deep-red-emitting α-Al 2O 3:Cr 3+ phosphor. Dalton Trans 2021; 50:12570-12582. [PMID: 34223857 DOI: 10.1039/d1dt00115a] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
Although it has been extensively studied for decades, the α-Al2O3:Cr3+ phosphor has rarely been investigated for horticultural lighting. In this work, for the first time, a prototype of a plant growth light-emitting diode (LED) has been fabricated by coating a deep-red-emitting α-Al2O3:Cr3+ phosphor onto a near-ultraviolet (NUV) chip. The α-Al2O3:Cr3+ phosphor, synthesized by a co-precipitation method and annealed at 1500 °C for 2 h, emits an outstanding narrow peak at 695 nm. The α-Al2O3:0.6%Cr3+ phosphor shows a high activation energy of 0.29 eV, a long lifetime of 3.4 ms, and a superior color purity of 100%. The chromatic coordinates and the QE value of the red LED obtained by coating an α-Al2O3:0.6%Cr3+ phosphor on a NUV chip are (x = 0.5650, y = 0.2429) and 87.1%, respectively.
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Affiliation(s)
- Nguyen Van Quang
- Department of Chemistry, Hanoi Pedagogical University 2, Phuc Yen, Vinh Phuc, Vietnam
| | - Nguyen Thi Huyen
- Department of Chemistry, Hanoi Pedagogical University 2, Phuc Yen, Vinh Phuc, Vietnam
| | - Nguyen Tu
- Faculty of Fundamental Science, Phenikaa University, Yen Nghia, Ha-Dong district, Hanoi 10000, Vietnam and Phenikaa Research and Technology Institute (PRATI), A&A Green Phoenix Group, 167 Hoang Ngan, Hanoi 10000, Vietnam.
| | - Do Quang Trung
- Faculty of Fundamental Science, Phenikaa University, Yen Nghia, Ha-Dong district, Hanoi 10000, Vietnam and Phenikaa Research and Technology Institute (PRATI), A&A Green Phoenix Group, 167 Hoang Ngan, Hanoi 10000, Vietnam.
| | - Dao Duc Anh
- Faculty of Materials Science and Engineering, Phenikaa University, Yen Nghia, Ha-Dong district, Hanoi 10000, Vietnam
| | - Manh Trung Tran
- Faculty of Materials Science and Engineering, Phenikaa University, Yen Nghia, Ha-Dong district, Hanoi 10000, Vietnam
| | - Nguyen Duy Hung
- Advanced Institute for Science and Technology (AIST), Hanoi University of Science and Technology (HUST), 01 Dai Co Viet street, Hanoi 10000, Vietnam
| | - Dao Xuan Viet
- Advanced Institute for Science and Technology (AIST), Hanoi University of Science and Technology (HUST), 01 Dai Co Viet street, Hanoi 10000, Vietnam
| | - Pham Thanh Huy
- Phenikaa Research and Technology Institute (PRATI), A&A Green Phoenix Group, 167 Hoang Ngan, Hanoi 10000, Vietnam. and Faculty of Materials Science and Engineering, Phenikaa University, Yen Nghia, Ha-Dong district, Hanoi 10000, Vietnam
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