Regulation of charge distribution for highly efficient colloidal quantum-well light-emitting diodes with deep-red emissions

Wenhui Fang; Chenlin Wang; Dongxiang Luo; Jun Gao; Yuan Liu; Jingyan Liao; Sui-Dong Wang; Zhengji Xu; Zhenyu Yang; Shaolin Liao; Yuan Gao; Baiquan Liu

doi:10.1002/inf2.70099

InfoMat ›› 2026, Vol. 8 ›› Issue (3) :e70099 DOI: 10.1002/inf2.70099

RESEARCH ARTICLE

Regulation of charge distribution for highly efficient colloidal quantum-well light-emitting diodes with deep-red emissions

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¹. Guangdong Provincial Key Laboratory of Display Materials and Technologies, State Key Laboratory of Optoelectronic Materials and Technologies, School of Electronics and Information Technology, Sun Yat-sen University, Guangzhou, The People's Republic of China

². Key Laboratory of Laser & Infrared System (Shandong University), Ministry of Education, School of Information Science and Engineering, Shandong University, Qingdao, The People's Republic of China

³. Huangpu Hydrogen Energy Innovation Centre, School of Chemistry and Chemical Engineering, Guangzhou University, Guangzhou, The People's Republic of China

⁴. School of Integrated Circuits, Guangdong University of Technology, Guangzhou, The People's Republic of China

⁵. Macao Institute of Materials Science and Engineering (MIMSE), MUST-SUDA Joint Research Center for Advanced Functional Materials, Macau University of Science and Technology, Taipa, The People's Republic of China

⁶. Guangdong Provincial Key Laboratory of Optoelectronic Information Processing Chips and Systems, School of Microelectronics Science and Technology, Sun Yat-sen University, Zhuhai, The People's Republic of China

⁷. MOE Laboratory of Bioinorganic and Synthetic Chemistry, Lehn Institute of Functional Materials, School of Chemistry, Sun Yat-sen University, Guangzhou, The People's Republic of China

⁸. Department of Electrical and Computer Engineering, Illinois Institute of Technology, Chicago, Illinois, USA

eeliuyuan@gdut.edu.cn

yuan.gao@sdu.edu.cn

liubq33@mail.sysu.edu.cn

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Abstract

Two-dimensional (2D) nanocrystals have recently risen to be highly promising for optoelectronics and microelectronics. However, it is a big challenge for 2D nanocrystals in the applications of long-wavelength regions (e.g., ≥660 nm) and the development of 2D nanocrystal light-emitting diodes (LEDs) with long-wavelength emissions is in its infancy. Here, colloidal quantum-well LEDs (CQW-LEDs) with long-wavelength emissions (671 nm) have been developed, simultaneously achieving high efficiency, extremely low efficiency roll-off, high luminance, ultra-saturated emission with CIE coordinates of (0.719, 0.280), and excellent color stability. The photoluminescence quantum yield of designed CdSe/CdZnS core/shell CQW films is as high as 92%. The resultant CQW-LEDs exhibit an external quantum efficiency (EQE) of 17.45% and a luminance of 9335 cd m⁻², which are record values for 2D nanocrystal LEDs with long-wavelength emissions. Experiments and simulations reveal that the high performance is attributed to the great enhancement of charge balance, which is fulfilled by the employment of effective triple hole transport layers. The strategy also enables red CQW-LEDs to achieve an EQE of 20.41%. Such results provide a new approach to obtain CQW-LEDs, pave the way to realize superior performance 2D nanocrystal LEDs with long-wavelength emissions, and give a deep insight to regulate charge distribution for nanocrystal LEDs.

Keywords

charge distribution / colloidal quantum-well / high efficiency / light-emitting diode / long-wavelength emission

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Wenhui Fang, Chenlin Wang, Dongxiang Luo, Jun Gao, Yuan Liu, Jingyan Liao, Sui-Dong Wang, Zhengji Xu, Zhenyu Yang, Shaolin Liao, Yuan Gao, Baiquan Liu. Regulation of charge distribution for highly efficient colloidal quantum-well light-emitting diodes with deep-red emissions. InfoMat, 2026, 8 (3) : e70099 DOI:10.1002/inf2.70099

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