Near‐Unity Quantum Yield Conductive Inks of Lead‐Free Double Perovskite Quantum Dots for White LEDs
Abstract
Abstract Double perovskite quantum dots (QDs) with self‐trapped exciton emission provide an eco‐friendly route to broadband white‐light generation. Yet severe charge losses arising from trap‐mediated recombination and inefficient carrier transport remain major obstacles to their integration into electroluminescent devices. Here, Sb 3+ /Mn 2+ co‐doped Cs 2 NaInCl 6 QD inks are reported that enable the fabrication of defect‐suppressed, conductive QD films with low charge transport and hole‐injection barriers in light‐emitting diode (LED) devices. Sb 3+ /Mn 2+ co‐doping not only induces white emission but also suppresses cation disorder, leading to near‐unity photoluminescence quantum yield. Moreover, replacing long‐chain ligands with short‐chain 2‐ethylhexanoic acid and 3,3‐diphenylpropylamine chloride enhances the film conductivity by nearly 20‐fold and induces a favorable band alignment with the poly(9‐vinylcarbazole):poly[ N , N ′‐bis(4‐butylphenyl)‐ N , N ′‐bis(phenyl)‐benzidine] hole transport layer, hereby reducing the injection barrier by 0.4 eV. These improvements enable an LED external quantum efficiency of 0.91% (0.05 cm 2 )—the highest reported for double perovskite QDs and nearly 1.3 the previous record. It is anticipated that this work provides a viable route toward overcoming the key limitations of double perovskite electroluminescence and advancing eco‐friendly solid‐state lighting.
Article Details
Authors (23)
Shikai Chen
Faculty of Informatics and Engineering The University of Electro‐Communications 1‐5‐1, Chofugaoka Chofu Tokyo 182‐8585 Japan
Dandan Wang
Yuyao Wei
Faculty of Informatics and Engineering The University of Electro‐Communications 1‐5‐1, Chofugaoka Chofu Tokyo 182‐8585 Japan
Yusheng Li
Yongge Yang
Faculty of Informatics and Engineering The University of Electro‐Communications 1‐5‐1, Chofugaoka Chofu Tokyo 182‐8585 Japan
Sujun Ji
Faculty of Informatics and Engineering The University of Electro‐Communications 1‐5‐1, Chofugaoka Chofu Tokyo 182‐8585 Japan
Yao Guo
Henan International Joint Laboratory of Nanocomposite Sensing Materials, School of Materials Science and Engineering
Dong Liu
Hefei National Research Center for Physical Sciences at the Microscale, School of Chemistry and Materials Science, National Synchrotron Radiation Laboratory
Jing Xia
Chinese Academy of Sciences , , ,
Huān Bì
i‐Powered Energy System Research Center (i‐PERC) The University of Electro‐Communications 1‐5‐1 Chofugaoka Chofu Tokyo 182‐8585 Japan
Jiaqi Liu
Guozheng Shi
School of Engineering Macquarie University Sydney NSW 2109 Australia
Keita Tosa
Faculty of Informatics and Engineering The University of Electro‐Communications 1‐5‐1, Chofugaoka Chofu Tokyo 182‐8585 Japan
Zhao Yang
Beijing National Laboratory for Molecular Sciences, Key Laboratory of Organic Solids, Institute of Chemistry
Ziying Wen
School of Chemistry and Chemical Engineering Academy of Opto‐Electric Technology Hefei University of Technology Hefei 230009 P. R. China
Boyu Zhang
Laboratory of Mathematics and Complex Systems, Ministry of Education, School of Mathematical Sciences
Hua Li
Qiao Li
Key Laboratory of Applied Surface and Colloid Chemistry, Ministry of Education and School of Chemistry and Chemical Engineering
Junpeng Xue
Jiangsu University of Science and Technology Zhenjiang 212100 P. R. China
Feng Liu
Yaohong Zhang
School of Physics Northwest University Xian 710127 P. R. China
Shuzi Hayase
i‐Powered Energy System Research Center (i‐PERC) The University of Electro‐Communications 1‐5‐1 Chofugaoka Chofu Tokyo 182‐8585 Japan
Qing Shen