Improving blue quantum dot light-emitting diodes by a lithium fluoride interfacial layer

Qu, Xiangwei1,2,3; Zhang, Nan2,3; Cai, Rui2,3; Kang, Bonan1; Chen, Shuming2,3; Xu, Bing2,3,4; Wang, Kai2,3; Sun, Xiao Wei2,3

2019-02-18

10.1063/1.5087102

APPLIED PHYSICS LETTERS   影响因子和分区

0003-6951

1077-3118

Unlike green and red quantum dot light-emitting diodes (QLEDs), electron injection is not sufficient for blue QLEDs due to a higher potential barrier at the quantum dot (QD)/ZnO interface. In this work, a lithium fluoride (LiF) interlayer is inserted between ZnO and the quantum dot layer to improve the efficiency and stability of blue QLEDs. The LiF interfacial layer facilitates electron injection into QDs through the electron tunneling effect and suppresses the exciton quenching at the QD/ZnO interface. As a result, the blue QLED devices show the maximum external quantum efficiency and current efficiency of 9.8% and 7.9 cd A(-1), respectively, which are 1.45 times and 1.39 times, respectively, higher than those of control devices. The operational lifetime of devices is also improved by two times. Our works indicate that interface engineering is an effective method for high efficiency and stable blue QLEDs. Published under license by AIP Publishing.

SCI ; EI

英语

NI期刊

通讯

Shenzhen Innovation Project[JCYJ20160301113356947]

Physics

Physics, Applied

WOS:000459554300001

AMER INST PHYSICS

20190906550728

Efficiency ; Electron injection ; Electron tunneling ; Fluorine compounds ; II-VI semiconductors ; Lithium Fluoride ; Nanocrystals ; Organic light emitting diodes (OLED) ; Semiconductor quantum dots ; Zinc oxide

Semiconductor Devices and Integrated Circuits:714.2 ; Nanotechnology:761 ; Inorganic Compounds:804.2 ; Production Engineering:913.1 ; Quantum Theory; Quantum Mechanics:931.4

PHYSICS

Web of Science

1.Jilin Univ, Coll Elect Sci & Engn, State Key Lab Integrated Optoelect, 2699 Qianjin St, Changchun 130012, Jilin, Peoples R China
2.Southern Univ Sci & Technol, Shenzhen Key Lab Adv Quantum Dot Displays, Guangdong Univ Key Lab Adv Quantum Dot Displays &, Shenzhen 518055, Peoples R China
3.Southern Univ Sci & Technol, Dept Elect & Elect Engn, Shenzhen 518055, Peoples R China
4.Shenzhen Planck Innovat Technol Pte Ltd, Ganli 6th Rd, Shenzhen 518112, Peoples R China

Qu, Xiangwei,Zhang, Nan,Cai, Rui,et al. Improving blue quantum dot light-emitting diodes by a lithium fluoride interfacial layer[J]. APPLIED PHYSICS LETTERS,2019,114(7).

Qu, Xiangwei.,Zhang, Nan.,Cai, Rui.,Kang, Bonan.,Chen, Shuming.,...&Sun, Xiao Wei.(2019).Improving blue quantum dot light-emitting diodes by a lithium fluoride interfacial layer.APPLIED PHYSICS LETTERS,114(7).

Qu, Xiangwei,et al."Improving blue quantum dot light-emitting diodes by a lithium fluoride interfacial layer".APPLIED PHYSICS LETTERS 114.7(2019).