期刊
JOURNAL OF MATERIALS CHEMISTRY C
卷 6, 期 38, 页码 10233-10240出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8tc03742f
关键词
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资金
- National Natural Science Foundation of China [21671044, 61605109]
- China Postdoctoral Science Foundation [2016M592463]
- Star of Science and the Technology of Guangdong Pearl River [201610010042]
- Excellent Young Teacher Development Project of Universities in Guangdong Province [YQ2015054]
- State Key Laboratory of Silicon Materials of Zhejiang University [SKL2017-11]
- Program for Professor of Special Appointment (Eastern Scholar) at Shanghai Institutions of Higher Learning [TP2015037]
Optimized white light emitting Ag,Mn:Zn-In-S quantum dots (QDs) were synthesized via a simple, scalable, reproducible, and low-cost one-pot non-injection synthetic approach. After coating a thick ZnS shell (similar to 12 monolayers) on the core QDs, high photoluminescence (PL) quantum yield (QY) up to 76% was achieved and high emission efficiency was retained even when the initially oil-soluble QDs were transferred into aqueous media by ligand replacement. Moreover, both thermal stability and photostability of thick shell-Ag,Mn:Zn-In-S/ZnS QDs were significantly enhanced as compared with those of Ag,Mn:Zn-In-S core QDs due to the suppressed surface defects resulting from the passivation of the dense ZnS layers. White quantum dot light-emitting diodes (QD-LEDs) were fabricated using thick shell Ag,Mn:Zn-In-S/ZnS QDs as single QDs emitter, showing good performance with maximum current efficiency of 1.86 cd A(-1 )corresponding to external quantum efficiency (EQE) of 0.82% at a current density of 0.065 mA cm(-2), color rendering indices (CRI) of 83, Commission International d'Eclairage (CIE) coordinates of (0.344, 0.393) and correlated color temperature (CCT) of 5156 K.
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