Bulk-like ZnSe Quantum Dots Enabling Efficient Ultranarrow Blue Light-Emitting Diodes

被引：142

作者：

Gao, Min ^{[1
,2
]}

Yang, Huawei ^{[1
,2
]}

Shen, Huaibin ^{[1
,2
]}

Zeng, Zaiping ^{[1
,2
]}

Fan, Fengjia ^{[3
,4
]}

Tang, Beibei ^{[3
,4
]}

Min, Jingjing ^{[1
,2
]}

Zhang, Ying ^{[1
,2
]}

Hua, Qingzhao ^{[1
,2
]}

Li, Lin Song ^{[1
,2
]}

Ji, Botao ^{[5
,6
]}

Du, Zuliang ^{[1
,2
]}

机构：

[1] Henan Univ, Key Lab Special Funct Mat, Minist Educ, Natl & Local Joint Engn Res Ctr High Efficiency D, Kaifeng 475004, Peoples R China

[2] Henan Univ, Collaborat Innovat Ctr Nano Funct Mat & Applicat, Kaifeng 475004, Peoples R China

[3] Univ Sci & Technol China, Synerget Innovat Ctr Quantum Informat & Quantum P, Hefei Natl Lab Phys Sci Microscale, Hefei 230026, Peoples R China

[4] Univ Sci & Technol China, Synerget Innovat Ctr Quantum Informat & Quantum P, Dept Modern Phys, CAS Key Lab Microscale Magnet Resonance, Hefei 230026, Peoples R China

[5] Westlake Univ, Key Lab 3D Micro Nano Fabricat & Characterizat Zh, Sch Engn, Hangzhou 310024, Peoples R China

[6] Westlake Inst Adv Study, Inst Adv Technol, Hangzhou 310024, Peoples R China

来源：

NANO LETTERS | 2021年 / 21卷 / 17期

基金：

中国国家自然科学基金;

关键词：

bulk-like quantum dots; light-emitting diodes; electroluminescence; ZnSe/ZnS; high efficiency; COLLOIDAL NANOCRYSTALS; HIGHLY EFFICIENT; HIGH-BRIGHTNESS; ENERGY-TRANSFER; DEVICES;

D O I：

10.1021/acs.nanolett.1c02284

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Blue-emitting heavy-metal free QDs simultaneously exhibiting photoluminescence quantum yield close to unity and narrow emission line widths are essential for next-generation electroluminescence displays, yet their synthesis is highly challenging. Herein, we develop the synthesis of blue-emitting QDs by growing a thin shell of ZnS on ZnSe cores with their size larger than bulk Bohr diameter. The bulk-like size of ZnSe cores enables the emission to locate in the blue region with a narrow emission width close to its intrinsic peak width. The obtained bulk-like ZnSe/ZnS core/shell QDs display high quantum yield of 95% and extremely narrow emission width of similar to 9.6 nm. Moreover, the bulk-like size of ZnSe cores reduces the energy level difference between QDs and adjacent layers in LEDs and improves charge transport. The LEDs fabricated with these high-quality QDs show bright pure blue emission with an external quantum efficiency of 12.2% and a relatively long operating lifetime.

引用

页码：7252 / 7260

页数：9

共 47 条

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