Stable and brightly luminescent all-inorganic cesium lead halide perovskite quantum dots coated with mesoporous silica for warm WLED

被引:57
|
作者
Di, Xiaoxuan [1 ]
Jiang, Jutao [1 ]
Hu, Zemin [1 ]
Zhou, Lei [1 ]
Li, Pengzhi [1 ]
Liu, Sijin [1 ]
Xiang, Weidong [1 ]
Liang, Xiaojuan [1 ]
机构
[1] Wenzhou Univ, Coll Chem & Mat Engn, Wenzhou 325035, Zhejiang, Peoples R China
基金
中国国家自然科学基金;
关键词
Perovskite quantum dots; Mesoporous silica; Ce3+:YAG phosphor-in-glass; Optical properties; Warm WLEDs; LIGHT-EMITTING-DIODES; WIDE COLOR GAMUT; WHITE LEDS; OPTOELECTRONIC MATERIALS; INP/ZNS NANOCRYSTALS; FLUORIDE PHOSPHORS; ROOM-TEMPERATURE; HIGH-EFFICIENCY; CSPBX3; DEVICES;
D O I
10.1016/j.dyepig.2017.07.028
中图分类号
O69 [应用化学];
学科分类号
081704 ;
摘要
All-inorganic CsPbX3 (X = Cl, Br, I) perovskite quantum dots (QDs) have been investigated owing to their novel optical properties, such as the high photoluminescence (PL) quantum yields (QYs), narrow line-with and tunable wavelength. However, the usual CsPbX3 QDs suffer from the instability and the anion-exchange reaction, which hinder their applications. In this work, we present an efficient approach towards stable solid-state QDs composites by coating the CsPbX3 QDs with the mesoporous silica matrixes (QDs/silica). The as-prepared QDs/silica composite not only maintain the QDs remarkable optical properties, but also improve their stability. Meanwhile, the approach also prevents the anion-exchange reaction between perovskite QDs of various halide compositions mixed together in the solid-state. Therefore, these excellent properties enable the QD/silica composite to improve the color rending index (CRI) and the correlated color temperature (CCT) of the traditional phosphor-converted white light-emitting diodes (WLEDs). Herein, for the first time, the red QD/silica composite was used as red phosphor and stacked on the Ce3+:YAG phosphor-in-glass (Ce-PiG) via screen-printing technology (Ce-PiG&R-QDs/silica). Subsequently, warm WLEDs were constructed by blending the Ce-PiG&R-QDs/silica materials with the InGaN blue chips. More importantly, the constructed WLEDs generate a warm white with an optimal luminous efficacy (LE) of 56 l m/W, a high CRI of 92, R9 of 90 and a low CCT of 4718 K. These results indicate that the QD/silica composites would have potential practical applications in warm WLEDs. (C) 2017 Elsevier Ltd. All rights reserved.
引用
收藏
页码:361 / 367
页数:7
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