CsPbBr3-Cs4PbBr6 composite nanocrystals for highly efficient pure green light emission

被引：40

作者：

He, Miao ^{[1
,2
]}

Chunyun, Wang ^{[3
,4
]}

Li, Jingzhou ^{[3
,4
]}

Wu, Jiang ^{[3
,4
]}

Zhang, Siwei ^{[3
,4
]}

Kuo, Hao-Chung ^{[5
,6
]}

Shao, Li-Yang ^{[7
]}

Zhao, Shichao ^{[8
]}

Zhang, Jinzhong ^{[1
,2
]}

Kang, Feiyu ^{[3
,4
]}

Wei, Guodan ^{[3
,4
]}

机构：

[1] East China Normal Univ, Dept Elect Engn, Key Lab Polar Mat & Devices MOE, Shanghai 200241, Peoples R China

[2] East China Normal Univ, Dept Elect Engn, Tech Ctr Multifunct Magneto Opt Spect Shanghai, Shanghai 200241, Peoples R China

[3] Tsinghua Univ, TBSI, Shenzhen 518055, Peoples R China

[4] Tsinghua Univ, Tsinghua Shenzhen Int Grad Sch, Shenzhen 518055, Peoples R China

[5] Univ Calif Berkeley, Dept Elect Engn & Comp Sci, Berkeley, CA 94720 USA

[6] Univ Calif Berkeley, TBSI, Berkeley, CA 94720 USA

[7] Southern Univ Sci & Technol, Dept Elect & Elect Engn, Shenzhen 518055, Peoples R China

[8] Hangzhou Dianzi Univ, Coll Mat & Environm Engn, Hangzhou 310018, Peoples R China

来源：

NANOSCALE | 2019年 / 11卷 / 47期

关键词：

CSPBBR3 QUANTUM DOTS; PEROVSKITE NANOCRYSTALS; EMITTING-DIODES; PHOTOLUMINESCENCE; TRANSFORMATION; ABSORPTION; POWDERS;

D O I：

10.1039/c9nr07096f

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

All-inorganic perovskite CsPbBr3-Cs4PbBr6 composite nanocrystals (NCs) were synthesized via a convenient solution process without inert gas protection and systematically studied as green phosphors for light emitting diode (LED) applications. While colloidal composite NCs emit green color with an emission peak at around 515 nm, their thin films on top of blue GaN chips exhibit a redshift of similar to 15-20 nm due to subsequential aggregation in solid state. The Commission Internationale De I'eclairage (CIE) chromaticity coordinates of the green LEDs assembled by composite NCs reached (0.201, 0.746) with nearly 100% green ratio. Moreover, the pure green LED displayed a luminous efficiency of 45 lm W-1 under 10 mA driving current. The colloidal CsPbBr3-Cs4PbBr6 composite NCs have the photoluminescence quantum yield (PLQY) as high as 74%. The high PLQY originates from cubic CsPbBr3 NCs well passivated by the zero-dimensional Cs4PbBr6 matrix, substantially suppressing the nonradiative recombination. The comparison between the green LEDs fabricated with pure and composite perovskites imply that the CsPbBr3-Cs4PbBr6 composites with higher quantum yield could be an effective way to get the brightness and the stability of pure green LEDs.

引用

页码：22899 / 22906

页数：8

共 45 条

[1] Precipitation and Optical Properties of CsPbBr3 Quantum Dots in Phosphate Glasses [J].