Near‐Unity Quantum Yield Conductive Inks of Lead‐Free Double Perovskite Quantum Dots for White LEDs
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<sup>3+</sup>/Mn<sup>2+</sup> co-doped Cs<sub>2</sub>NaInCl<sub>6</sub> 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<sup>3+</sup>/Mn<sup>2+</sup> 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<sup>2</sup>)-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.
Authors
- Yao Guo (ORCID: https://orcid.org/0000-0002-3964-8002)
- Yongge Yang (ORCID: https://orcid.org/0009-0001-0595-4968)
- Jing Xia (ORCID: https://orcid.org/0000-0001-6092-1344)
- Hua̅n Bì (ORCID: https://orcid.org/0000-0001-7680-9816)
- Qing Shen (ORCID: https://orcid.org/0000-0001-8359-3275)
- Yaohong Zhang (ORCID: https://orcid.org/0000-0001-7789-4784)
- Ziying Wen
- Yuyao Wei (ORCID: https://orcid.org/0000-0002-6449-2169)
- Guozheng Shi (ORCID: https://orcid.org/0000-0001-7703-7360)
- Sujun Ji
- Shuzi Hayase (ORCID: https://orcid.org/0000-0002-0756-4808)
- Boyu Zhang (ORCID: https://orcid.org/0009-0003-1911-4358)
- Hua Li (ORCID: https://orcid.org/0000-0002-0982-5573)
- Jiaqi Liu (ORCID: https://orcid.org/0000-0002-5738-4741)
- Dong Liu (ORCID: https://orcid.org/0009-0007-1901-4604)
- Dandan Wang (ORCID: https://orcid.org/0000-0001-8729-8847)
- Yusheng Li (ORCID: https://orcid.org/0000-0002-1472-8153)
- Feng Liu (ORCID: https://orcid.org/0000-0002-6903-6840)
- Junpeng Xue
- Li Qiao (ORCID: https://orcid.org/0000-0002-2957-8004)
- Yang Zhao (ORCID: https://orcid.org/0000-0002-3962-2793)
- Shikai Chen (ORCID: https://orcid.org/0000-0001-7821-7056)
- Keita Tosa
Institutions
- National Laboratory of the Rockies (US)
- Shandong University (CN)
- Hefei University of Technology (CN)
- Chinese Academy of Sciences (CN)
- University of Electro-Communications (JP)
- Northwest University (CN)
- Jiangsu University of Science and Technology (CN)
- Technical Institute of Physics and Chemistry (CN)
- Anyang Institute of Technology (CN)
Publication Details
- Journal
- Advanced Materials
- Published
- 2025-09-26
- DOI
- https://doi.org/10.1002/adma.202510643
- Citations
- 1
- Primary Topic
- Perovskite Materials and Applications
- Type
- article
- Field-Weighted Citation Impact
- 0.73