Synthesis of CsCu2I3 Nanocrystalline Films by Mixed Antisolvent Strategy for Light-emitting Diodes

被引：0
|
作者：
Ji X. [1 ]
Ma Z. [1 ]
Tian S. [2 ]
Jia M. [1 ]
Chen X. [1 ]
Shi Z. [1 ]
机构：
[1] Key Laboratory of Materials Physics of Ministry of Education, School of Physics and Microelectronics, Zhengzhou University, Zhengzhou
[2] Henan Chaowei Photoelectric Technology Co. LTD, Zhengzhou
来源：
Faguang Xuebao/Chinese Journal of Luminescence | 2023年 / 44卷 / 03期
基金：
中国国家自然科学基金;
关键词：
anti-solvent; CsCu[!sub]2[!/sub]I[!sub]3[!/sub; nanocrystalline films; yellow LED;
D O I：
10.37188/CJL.20220424
中图分类号：
学科分类号：
摘要：
Recently，the emerging ternary copper-based halide（CsCu2I3）materials have attracted much attention in the application of environmentally friendly light-emitting diodes（LEDs）due to their high photoluminescence quantum yield（PLQY），non-toxicity，good stability，and low cost. However，the synthesis of high-quality CsCu2I3 light-emitting films is still a great challenge due to the ungovernable crystallization dynamics of the CsCu2I3，which limits the further improvement of device performance. Here，by using a mixed solvent of toluene and methanol as an antisolvent to improve the pinning effect from the antisolvent，increasing the nucleation density of CsCu2I3 crystals，and reducing the grain size of the films，a smooth and dense CsCu2I3 nanocrystalline film was formed. Moreover，the mixed antisolvent strategy can effectively enhance the radiative recombination efficiency and significantly improve the PL properties of the CsCu2I3 films. Compared with the control sample（only using toluene），the PLQY of the films prepared by the mixed antisolvent method is increased by 1. 5 times，and the exciton binding energy was increased from ~201. 6 meV to ~234. 5 meV. Finally，the maximum luminance and the external quantum efficiency of the CsCu2I3 LED based on the mixed antisolvent strategy were enhanced by 5. 5 times and 1. 6 times compared with the control device，respectively. The results of this work are not only conducive to deepening the understanding of crystallization laws during the preparation of CsCu2I3 films，but also help to further promote the device performance of CsCu2I3based environmentally friendly LEDs. © 2023 Chines Academy of Sciences. All rights reserved.
引用
收藏
页码：559 / 568
页数：9
相关论文
共 31 条
  • [1] CAO Y, WANG N N，, TIAN H，, Et al., Perovskite light-emitting diodes based on spontaneously formed submicrometre-scale structures［J］, Nature, 562, 7726, pp. 249-253, (2018)
  • [2] LIN K B，, XING J, QUAN L N，, Et al., Perovskite light-emitting diodes with external quantum efficiency exceeding 20 percent［J］, Nature, 562, 7726, pp. 245-248, (2018)
  • [3] CHIBA T, HAYASHI Y, Et al., Anion-exchange red perovskite quantum dots with ammonium iodine salts for highly efficient light-emitting devices［J］, Nat. Photonics, 12, 11, pp. 681-687, (2018)
  • [4] JIANG F Y, LIU J L, ZHANG J L, Et al., Semiconductor yellow light-emitting diodes［J］, Acta Phys. Sinica, 68, 16, (2019)
  • [5] XU H Y, LIU M S, JIANG M M, Et al., High-brightness yellow light-emitting diode in a single Ga-doped ZnO∶Ga microw-ire heterojunction［J］, Chin. J. Lumin, 43, 8, pp. 1165-1174, (2022)
  • [6] KOVALENKO M V, PROTESESCU L, BODNARCHUK M I., Properties and potential optoelectronic applications of lead halide perovskite nanocrystals［J］, Science, 358, 6364, pp. 745-750, (2017)
  • [7] VASHISHTHA P, HALPERT J E., Field-driven ion migration and color instability in red-emitting mixed halide perovskite nanocrystal light-emitting diodes［J］, Chem. Mater, 29, 14, pp. 5965-5973, (2017)
  • [8] WANG M, MA Z Z，, CHEN X, Et al., Synthesis and photoluminescence properties of lead-free copper-based halide Rb<sub>2</sub>CuBr<sub>3</sub>［J］, Chin. J. Liq. Cryst. Disp, 36, 1, pp. 134-140, (2021)
  • [9] LIU N, Et al., Light-emitting diodes based on all-inorganic copper halide perovskite with self-trapped excitons［J］, J. Semicond, 41, 5, (2020)
  • [10] SHI Z F，, QIN C C，, Et al., Stable yellow light-emitting devices based on ternary copper halides with broadband emissive self-trapped excitons［J］, ACS Nano, 14, 4, pp. 4475-4486, (2020)
1234