Growth of Nanosized Single Crystals for Efficient Perovskite Light-Emitting Diodes

被引：118

作者：

Lee, Seungjin ^{[1
]}

Park, Jong Hyun ^{[1
]}

Nam, Yun Seok ^{[1
]}

Lee, Bo Ram ^{[2
,4
]}

Zhao, Baodan ^{[2
]}

Di Nuzzo, Daniele ^{[2
]}

Jung, Eui Dae ^{[1
]}

Jeon, Hansol ^{[1
]}

Kim, Ju-Young ^{[1
]}

Jeong, Hu Young ^{[3
]}

Friend, Richard H. ^{[2
]}

Song, Myoung Hoon ^{[1
]}

机构：

[1] Ulsan Natl Inst Sci & Technol, Sch Mat Sci & Engn, UNIST Gil 50, Ulsan 44919, South Korea

[2] Cavendish Lab, JJ Thomson Ave, Cambridge CB3 0HE, England

[3] Ulsan Natl Inst Sci & Technol, UNIST Cent Res Facil, UNIST Gil 50, Ulsan 44919, South Korea

[4] Pukyong Natl Univ, Dept Phys, 5 Yongso Ro, Busan 48513, South Korea

来源：

ACS NANO | 2018年 / 12卷 / 04期

基金：

英国工程与自然科学研究理事会;

关键词：

perovskite light-emitting diode; nanosized single crystal; amine ligand; defect site; electroluminescence blinking; LEAD HALIDE PEROVSKITES; SOLAR-CELLS; NANOCRYSTALLINE PEROVSKITE; OPTICAL-PROPERTIES; PHOTOLUMINESCENCE; PERFORMANCE; IODIDE; PASSIVATION; HYSTERESIS; BLINKING;

D O I：

10.1021/acsnano.7b09148

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Organic inorganic hybrid perovskites are emerging as promising emitting materials due to their narrow full-width at half maximum emissions, color tunability, and high photoluminescence quantum yields (PLQYs). However, the thermal generation of free charges at room temperature results in a low radiative recombination rate and an excitation-intensity-dependent PLQY, which is associated with the trap density. Here, we report perovskite films composed of uniform nanosized single crystals (average diameter = 31.7 nm) produced by introducing bulky amine ligands and performing the growth at a lower temperature. By effectively controlling the crystal growth, we maximized the radiative bimolecular recombination yield by reducing the trap density and spatially confining the charges. Finally, highly bright and efficient green emissive perovskite light emitting diodes that do not suffer from electroluminescence blinking were achieved with a luminance of up to 55 400 cd m(-2), current efficiency of 55.2 cd A(-1), and external quantum efficiency of 12.1%.

引用

页码：3417 / 3423

页数：7

共 31 条

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