Highly Efficient White‐Light Emission Triggered by Sb3+ Dopant in Indium‐Based Double Perovskites. Issue 12 (23rd September 2021)

• Record Type: Journal Article
• Authors: Zhou, Bo; Liu, Zexiang; Li, Henan; Fang, Shaofan; Fang, Feier; Wang, Ye; Chen, Fuming; Shi, Yumeng
• Is Part Of: Advanced photonics research. Volume 2:Issue 12(2021)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2021-09-23
• Subjects: aqueous-phase synthesis -- high photoluminescence quantum yield -- Sb3+-doped indium-based double perovskites -- self-trapped excitons -- tunable white-light; Photonics -- Periodicals; 621.36505
• DOI: 10.1002/adpr.202100143
• Languages: English
• ISSNs: 2699-9293

Abstract

Abstract : Inorganic indium‐based halide double perovskites (DPs) are environmentally friendly alternatives to lead‐based halide perovskites in light‐emitting diodes, but commonly suffer from low quantum efficiency and harsh synthesis conditions. Herein, a large‐scale green method using water as solvent is developed for the synthesis of 3D Cs2 NaInCl6 and 0D Cs2 InCl5 ·H2 O with/without Sb 3+ dopant at room temperature. The transformation between Cs2 InCl5 ·H2 O and Cs2 NaInCl6 products is controlled by the concentration of eco‐friendly NaCl, where excess Cl − and Na + ions play important roles in inhibiting In 3+ hydrolysis and promoting Cs2 NaInCl6 crystallization, respectively. The obtained Cs2 NaInCl6 :Sb and Cs2 InCl5 ·H2 O:Sb exhibit highly luminescent self‐trapped exciton‐related blue (450 nm; photoluminescence quantum yield [PLQY] ≈85%) and yellow (610 nm; PLQY ≈88%) emissions, which are comparable to those obtained by previous methods. Tunable cold/warm white light with a PLQY of up to ≈73% is achieved by the rational assembly of two components with highly overlapped excitation wavelength ranges. Each component demonstrates remarkable stability against humidity and heat. This composite shows great potential in solid‐state lighting for general illumination. Abstract : Highly luminescent white light with a 73% photoluminescence quantum yield is obtained from Sb 3+ ‐doped Cs2 NaInCl6 and Cs2 InCl5 ·H2 O perovskites due to highly overlapped excitation. The transformation between Cs2 NaInCl6 and Cs2 InCl5 ·H2 O can be controlled by NaCl in aqueous solution.