Spacer cation enabled dimension control for efficient and wavelength-tunable blue perovskite light-emitting diodes

Qingxiang Liu; Xinan Wu; Aidan H Coffey; Hanjun Yang; Jee Yung Park; Qixuan Hu; Ke Ma; Chenhui Zhu; Yong Sheng Zhao; Letian Dou; Kang Wang

doi:10.1039/d5cc01292a

Spacer cation enabled dimension control for efficient and wavelength-tunable blue perovskite light-emitting diodes

Chem Commun (Camb). 2025 May 20;61(42):7644-7647. doi: 10.1039/d5cc01292a.

Authors

Qingxiang Liu^{1

2}, Xinan Wu^{3

4}, Aidan H Coffey⁵, Hanjun Yang^{3

6}, Jee Yung Park^{3

7

8}, Qixuan Hu³, Ke Ma³, Chenhui Zhu⁵, Yong Sheng Zhao^{1

2}, Letian Dou^{3

6}, Kang Wang^{1

2}

Affiliations

¹ Key Laboratory of Photochemistry, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China. kangwang@iccas.ac.cn.
² School of Chemical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China.
³ Davidson School of Chemical Engineering, Purdue University, West Lafayette, IN 47907, USA. dou10@purdue.edu.
⁴ School of Physics, Peking University, Beijing 100871, China.
⁵ Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA.
⁶ Department of Chemistry, Purdue University, West Lafayette, Indiana 47907, USA.
⁷ Department of Chemical and Environmental Engineering, Yale University, New Haven, CT 06511, USA.
⁸ Energy Sciences Institute, Yale University, West Haven, CT 06516, USA.

PMID: 40302618
DOI: 10.1039/d5cc01292a

Abstract

This study explores a conjugated spacer molecule, biphenylethylammonium bromide (bPEA), to enable efficient dimension control in quasi-two-dimensional perovskites for blue light-emitting diodes. The incorporation of bPEA improves the optoelectronic properties, thereby delivering a peak external quantum efficiency of 7.0% at 483 nm and tunable emission from 493 to 466 nm.