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Hu L, Zhao W, Duan W, Chen G, Fan B, Zhang X. Temperature-Dependent Optical Properties of Perovskite Quantum Dots with Mixed-A-Cations. MICROMACHINES 2022; 13:mi13030457. [PMID: 35334748 PMCID: PMC8955971 DOI: 10.3390/mi13030457] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/20/2022] [Revised: 03/07/2022] [Accepted: 03/14/2022] [Indexed: 02/03/2023]
Abstract
In this work, metal halide perovskite quantum dots (QDs) with Formamidinium (FA) and Cs mixed cations were fabricated using a solution-processed method at room temperature. By controlling Cs doping ratios in a precursor, the optical properties of mixed-cation perovskite QDs were systematically studied. With the increase in Cs ion doping, the photoluminescence (PL) spectra of perovskite QDs were blueshifted, which was mainly due to the smaller radius of Cs ions than those of FA. Temperature-dependent PL spectra were conducted on mixed-cation perovskite QDs. As the temperature gradually increased from 4 K to 300 K, PL peaks were blue shifted, and full-width at half maximum (FWHM) was widened, which was directly related to lattice thermal expansion and the carrier-photon coupling effect under temperature variation. At the same time, excess Cs ion doping had a prominent influence on optical properties at low temperatures, which was mainly due to the introduction of detrimental defects in perovskite crystals. Therefore, it is particularly important to control doping concentration in the preparation of high-quality perovskite QDs and efficient photoelectric devices.
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Affiliation(s)
- Lei Hu
- Guangdong Provincial Key Laboratory of Information Photonics Technology, Guangdong University of Technology, Guangzhou 510006, China; (L.H.); (W.D.)
| | - Weiren Zhao
- Guangdong Provincial Key Laboratory of Information Photonics Technology, Guangdong University of Technology, Guangzhou 510006, China; (L.H.); (W.D.)
- Correspondence: (W.Z.); (B.F.); (X.Z.); Tel.: +86-15602234414 (X.Z.)
| | - Weijia Duan
- Guangdong Provincial Key Laboratory of Information Photonics Technology, Guangdong University of Technology, Guangzhou 510006, China; (L.H.); (W.D.)
| | - Guojie Chen
- Guangdong-Hongkong-Macao Joint Laboratory for Intelligent Micro-Nano Optoelectronic Technology, School of Physics and Optoelectronic Engineering, Foshan University, Foshan 528225, China;
| | - Bingfeng Fan
- Guangdong-Hongkong-Macao Joint Laboratory for Intelligent Micro-Nano Optoelectronic Technology, School of Physics and Optoelectronic Engineering, Foshan University, Foshan 528225, China;
- Correspondence: (W.Z.); (B.F.); (X.Z.); Tel.: +86-15602234414 (X.Z.)
| | - Xiaoli Zhang
- Guangdong Provincial Key Laboratory of Information Photonics Technology, Guangdong University of Technology, Guangzhou 510006, China; (L.H.); (W.D.)
- Correspondence: (W.Z.); (B.F.); (X.Z.); Tel.: +86-15602234414 (X.Z.)
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Chen C, Nie L, Huang Y, Xi S, Liu X, Zhang X, Shi T, Liao G, Liu S, Tang Z. Embedded growth of colorful CsPbX 3(X = Cl, Br, I) nanocrystals in metal-organic frameworks at Room Temperature. NANOTECHNOLOGY 2022; 33:175603. [PMID: 35026737 DOI: 10.1088/1361-6528/ac4b2d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/25/2021] [Accepted: 01/13/2022] [Indexed: 06/14/2023]
Abstract
Herein, we develop a novel strategy for preparing all-inorganic cesium lead halide (CsPbX3, X = Cl, Br, I) perovskite nanocrystals (NCs)@Zn-based metal-organic framework (MOF) composites through interfacial synthesis. The successful embedding of fluorescent perovskite NCs in Zn-MOFs is due to thein situconfined growth, which is attributed to the re-nucleation of water-triggered phase transformation from Cs4PbBr6to CsPbBr3. The controllable synthesis of mixed-halide based composites with various emission wavelength can be achieved by adding the desired amount of halide (Cl or I) salts in the re-nucleation process. More importantly, the anion exchange reaction is inhibited among various composites with different halogen atoms by being trapped in MOFs. Besides, a white light-emitting diode (WLED) is produced using a blue LED chip with the green-emitting and red-emitting composites, which has a color coordinate of (0.3291, 0.3272) and a wide color gamut. This work provides a novel route to achieving perovskite NCs growth in MOFs, which also can be extended to the other NCs embedded in frames as well.
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Affiliation(s)
- Chen Chen
- School of Mechanical Engineering, Hubei University of Technology, Wuhan 430068, People's Republic of China
| | - Lei Nie
- School of Mechanical Engineering, Hubei University of Technology, Wuhan 430068, People's Republic of China
| | - Yizhe Huang
- School of Mechanical Engineering, Hubei University of Technology, Wuhan 430068, People's Republic of China
| | - Shuang Xi
- School of Mechanical and Electronic Engineering, Nanjing Forestry University, Nanjing 210037, People's Republic of China
| | - Xingyue Liu
- State Key Laboratory of Digital Manufacturing Equipment and Technology, Huazhong University of Science and Technology (HUST), Wuhan 430074, People's Republic of China
| | - Xiwen Zhang
- State Key Laboratory of Digital Manufacturing Equipment and Technology, Huazhong University of Science and Technology (HUST), Wuhan 430074, People's Republic of China
| | - Tielin Shi
- State Key Laboratory of Digital Manufacturing Equipment and Technology, Huazhong University of Science and Technology (HUST), Wuhan 430074, People's Republic of China
| | - Guanglan Liao
- State Key Laboratory of Digital Manufacturing Equipment and Technology, Huazhong University of Science and Technology (HUST), Wuhan 430074, People's Republic of China
| | - Shiyuan Liu
- State Key Laboratory of Digital Manufacturing Equipment and Technology, Huazhong University of Science and Technology (HUST), Wuhan 430074, People's Republic of China
| | - Zirong Tang
- State Key Laboratory of Digital Manufacturing Equipment and Technology, Huazhong University of Science and Technology (HUST), Wuhan 430074, People's Republic of China
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