Enhancement of self-trapped excitons and near-infrared emission in Bi3+/Er3+ co-doped Cs2Ag0.4Na0.6InCl6 double perovskite. Issue 47 (24th November 2022)

• Record Type: Journal Article
• Authors: Dave, Kashyap; Huang, Wen-Tse; Leśniewski, Tadeusz; Lazarowska, Agata; Grzegorczyk, Maciej; Mahlik, Sebastian; Leniec, Grzegorz; Kaczmarek, Sławomir M.; Liu, Ru-Shi
• Is Part Of: Nanoscale. Volume 14:Issue 47(2022)
• Page Start: 17735
• Page End: 17742
• Publication Date: 2022-11-24
• Subjects: Nanoscience -- Periodicals; Nanotechnology -- Periodicals; 620.505
• DOI: 10.1039/d2nr05478g
• Languages: English
• ISSNs: 2040-3364

Abstract

Abstract : Self-trapped exciton-derived energy transfer is a possible strategy to enhance the emission of Er at 1540 nm in lead-free double perovskite structures. Abstract : Erbium (Er) complexes are used as optical gain materials for signal generation in the telecom C-band at 1540 nm, but they need a sensitizer to enhance absorption. Na + substitution for Ag + and Bi 3+ doping at the In 3+ site is a possible strategy to enhance the broadband emission of Cs2 AgInCl6, which could be used as a sensitizer for energy transfer to rare-earth elements. Herein, self-trapped exciton (STE) energy transfer to Er 3+ at 1540 nm in double perovskite is reported. An acid precipitation method was used to synthesize Cs2 AgInCl6 and its derivatives with Er 3+, Bi 3+, and Na + . Bare Cs2 AgInCl6 :Er emission signals were found to be weak at 1540 nm, but Bi 3+ doping increased them by 12 times, and Bi 3+ and Na + doping increased signal intensity by up to 25 times. Electron paramagnetic resonance spectroscopy characterized a decrease in axial symmetry over the Er 3+ ions after the substitutions of Na + and Bi 3+ in Cs2 AgInCl6 at low temperatures (<7 K) for the first time. Moreover, an increase in pressure compressed the structure, which tuned the STE transition for free exciton emission, and a further increase in pressure distorted the cubic phase above 70 kbar.