Enhancing hole injection by electric dipoles for efficient blue InP QLEDs

Tan，Yangzhi1,2; Zhang，Wenda1,2; Xiao，Xiangtian1,2,3; Sun，Jiayun1,2,3; Ma，Jingrui1,2; Zhang，Tianqi1,2; Mei，Guanding1,2,3; Wang，Zhaojin1,2; Zhao，Fangqing1,2; Wu，Dan4; Choy，Wallace C.H.3; Sun，Xiao Wei1,2; Wang，Kai1,2

2021-11-29

10.1063/5.0071508

APPLIED PHYSICS LETTERS   影响因子和分区

0003-6951

1077-3118

The unbalanced carrier injection is a key factor that deteriorates the performance of blue InP quantum dot light-emitting diodes (QLEDs). Therefore, to achieve efficient blue InP QLEDs, an effective strategy that balances carrier injection through enhancing the hole injection and transport is in demand. In this study, we introduced an ultrathin MoO3 electric dipole layer between the hole injection layer and the hole transport layer (HTL) to form a pair of dipole-induced built-in electric fields with forward resultant direction to enhance hole injection and facilitate the balance of carrier injection. Meanwhile, the p-doping effect by MoO3 leads to increased carrier concentration and decreased trap density of interfacial HTL, therefore improved its effective hole mobility. Consequently, the maximal external quantum efficiency of blue InP QLEDs was enhanced from 1.0% to 2.1%. This work provides an effective method to balance carrier injection by modulating hole injection and transport, indicating the feasibility to realize high-efficiency QLEDs.

SCI ; EI

英语

NI论文

第一 ; 通讯

National Key Research and Development Program[

Physics

Physics, Applied

WOS:000754310500005

AIP Publishing

20215011309363

Carrier concentration ; Charge injection ; Efficiency ; Electric fields ; Electron injection ; Hole mobility ; III-V semiconductors ; Indium phosphide ; Molybdenum oxide ; Quantum efficiency ; Semiconducting indium phosphide ; Semiconductor quantum dots

Electricity: Basic Concepts and Phenomena:701.1 ; Semiconducting Materials:712.1 ; Compound Semiconducting Materials:712.1.2 ; Semiconductor Devices and Integrated Circuits:714.2 ; Chemical Products Generally:804 ; Inorganic Compounds:804.2 ; Production Engineering:913.1 ; Quantum Theory; Quantum Mechanics:931.4

PHYSICS

2-s2.0-85120744908

Scopus

1.Guangdong University Key Lab for Advanced Quantum Dot Displays and Lighting,Guangdong-Hong Kong-Macao Jt. Lab. for Photonic-Thermal-Electrical Energy Materials and Devices,Department of Electrical and Electronic Engineering,Southern University of Science and Technology,Shenzhen,518055,China
2.Key Laboratory of Energy Conversion and Storage Technologies,Southern University of Science and Technology,Ministry of Education,Shenzhen,518055,China
3.Department of Electrical and Electronic Engineering,The University of Hong Kong,Hongkong,999077,Hong Kong
4.College of New Materials and New Energies,Shenzhen Technology University,Shenzhen,518118,China

Tan，Yangzhi,Zhang，Wenda,Xiao，Xiangtian,et al. Enhancing hole injection by electric dipoles for efficient blue InP QLEDs[J]. APPLIED PHYSICS LETTERS,2021,119(22).

Tan，Yangzhi.,Zhang，Wenda.,Xiao，Xiangtian.,Sun，Jiayun.,Ma，Jingrui.,...&Wang，Kai.(2021).Enhancing hole injection by electric dipoles for efficient blue InP QLEDs.APPLIED PHYSICS LETTERS,119(22).

Tan，Yangzhi,et al."Enhancing hole injection by electric dipoles for efficient blue InP QLEDs".APPLIED PHYSICS LETTERS 119.22(2021).