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Facile Assembly of High‐Quality Organic–Inorganic Hybrid Perovskite Quantum Dot Thin Films for Bright Light‐Emitting Diodes
Author(s) -
Jin Xiangcheng,
Zhang Xiujuan,
Fang Huan,
Deng Wei,
Xu Xiuzhen,
Jie Jiansheng,
Zhang Xiaohong
Publication year - 2018
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.201705189
Subject(s) - quantum dot , photoluminescence , materials science , fabrication , light emitting diode , perovskite (structure) , optoelectronics , diode , quantum efficiency , thin film , nanotechnology , chemistry , organic chemistry , medicine , alternative medicine , pathology
Organic‐inorganic hybrid perovskite (CH 3 NH 3 PbX 3 , X = Cl, Br or I) quantum dots (QDs) have shown superior optoelectronic properties and have been regarded as a most ideal material for next‐generation optoelectronic devices, particularly for QDs‐based light‐emitting diodes (QLEDs). However, there are only a few reports on CH 3 NH 3 PbX 3 QLEDs and the reported performance is still very poor, primarily due to the difficulties in the fabrication of high‐quality compact QDs thin films. In this work, an electric‐field‐assisted strategy is developed for efficient fabrication of uniform CH 3 NH 3 PbBr 3 QDs thin films with high photoluminescence quantum yields (PLQY, 80%–90%) from dilute CH 3 NH 3 PbBr 3 QDs suspensions (≈0.1 mg mL ‐1 ) within 5 mins. Benefited from the high‐quality CH 3 NH 3 PbBr 3 QDs thin films, the corresponding QLEDs deliver a highly bright green emission with maximum luminances of 12450 cd m 2 . Furthermore, a current efficiency of 12.7 cd A ‐1 , a power efficiency of 9.7 lm W ‐1 , and an external quantum efficiency (EQE) of 3.2% were acheived by enhancing the hole injection. This performance represents the best results for CH 3 NH 3 PbBr 3 QDs‐based QLEDs reported to date. These results indicate an important progress in the fabrication of high‐performance CH 3 NH 3 PbX 3 QLEDs and demonstrate their huge potential for next‐generation displays and lighting.