Improvement in Luminous Efficacy and Thermal Performance Using Quantum Dots Spherical Shell for White Light Emitting Diodes

被引：15

作者：

Chen, Songmao ^{[1
]}

Yan, Caiman ^{[1
]}

Tang, Yong ^{[1
]}

Li, Jiasheng ^{[1
,2
]}

Ding, Xinrui ^{[1
]}

Rao, Longshi ^{[1
]}

Li, Zongtao ^{[1
,2
]}

机构：

[1] South China Univ Technol, Guangdong High Educ Inst, Key Lab Surface Funct Struct Mfg, Guangzhou 510641, Guangdong, Peoples R China

[2] Foshan Nationstar Optoelect Co Ltd, Foshan 528000, Peoples R China

来源：

NANOMATERIALS | 2018年 / 8卷 / 08期

基金：

中国国家自然科学基金;

关键词：

chip-on-board; quantum dots; spherical shell structure; white light-emitting diode; UNIFORMITY; LEDS; ENHANCEMENT; STABILITY; CCT;

D O I：

10.3390/nano8080618

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

White light-emitting diodes (WLEDs) based on quantum dots (QDs) are gaining increasing attention due to their excellent color quality. QDs films with planar structure are universally applied in WLEDs for color conversion, while they still face great challenges in high light extraction and thermal stability. In this study, a QDs film with a spherical shell structure was proposed to improve the optical and thermal performance for WLEDs. Compared with the conventional planar structure, the luminous efficacy of the QDs spherical shell structure is improved by 12.9% due to the reduced total reflection effect, and the angular-dependent correlated color temperature deviation is decreased from 2642 to 283 K. Moreover, the highest temperature of the WLED using a QDs spherical shell is 4.8 degrees C lower than that of the conventional WLED with a planar structure, which is mainly attributed to larger heat dissipation area and separated heat source. Consequently, this QDs spherical shell structure demonstrates superior performance of QDs films for WLEDs applications.

引用

页数：9

共 33 条

[1] A novel randomly textured phosphor structure for highly efficient white light-emitting diodes [J].