標題: Effect of Washing Solvents on the Properties of Air-Synthesized Perovskite CsPbBr3 Quantum Dots for Quantum Dot-Based Light-Emitting Devices
作者: Chen, Lung-Chien
Tien, Ching-Ho
Tseng, Po-Wei
Tseng, Zong-Liang
Huang, Wei-Lun
Xu, You-Xun
Kuo, Hao-Chung
光電工程學系
光電工程研究所
Department of Photonics
Institute of EO Enginerring
關鍵字: Optoelectronic devices;light emitting diodes;quantum dots;perovskite;CsPbBr3
公開日期: 1-Jan-2020
摘要: In order to improve the stability and cost of perovskite CsPbBr3 and establish a preparation process for quantum dot materials with excellent luminescence properties, CsPbBr3 quantum dots were synthesized by the hot injection method and the ice bath method in air ambient. Then, a proprietary purification system was used to improve the properties of the quantum dots and prepare high-quality perovskite quantum dot films. Optimal material and light characteristics were exhibited with ethyl acetate:hexane as the purification solvent. In the solution form, the photoluminescence wavelength could be maintained at 508 nm with almost no shift compared with other conditions, and the quantum yield could reach 99%; however, superior performance was obtained in the thin-film form, which exhibited little to no shift in the photoluminescence wavelength and, surprisingly, achieved a quantum yield of 91.6% with a narrow PL emission with a full width at half-maximum of 28 nm. In addition, exceptional thin-film uniformity was observed from scanning electron microscopy image analyses. The CsPbBr3 quantum dot light-emitting diode purified with ethyl acetate:hexane demonstrated an open-circuit voltage of 4 V, a maximum luminous brightness of 488 cd m(-2), and a maximum external quantum efficiency of 0.14%.
URI: http://dx.doi.org/10.1109/ACCESS.2020.3020594
http://hdl.handle.net/11536/155400
ISSN: 2169-3536
DOI: 10.1109/ACCESS.2020.3020594
期刊: IEEE ACCESS
Volume: 8
起始頁: 159415
結束頁: 159423
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