Simultaneous enhancement of near infrared luminescence and stability of Cs2AgInCl6:Cr3+ double perovskite single crystals enabled by a Yb3+ dopant. Issue 18 (26th July 2022)

• Record Type: Journal Article
• Authors: Chen, Daiwen; Zhang, Xinguo; Wei, Jianwu; Zhou, Liya; Chen, Peican; Pang, Qi; Zhang, Jin Zhong
• Is Part Of: Inorganic chemistry frontiers. Volume 9:Issue 18(2022)
• Page Start: 4695
• Page End: 4704
• Publication Date: 2022-07-26
• Subjects: Chemistry, Inorganic -- Periodicals; 546.05
• DOI: 10.1039/d2qi01104b
• Languages: English
• ISSNs: 2052-1553

Abstract

Abstract : Cs2 AgInCl6 :Cr 3+, Yb 3+ double perovskite single crystals was prepared by hydrothermal method, which shows NIR emission from 800 to 1400 nm with a peak at 1000 nm and a full-width at half maximum of 188 nm with a higher PLQY of ∼45% excited at 365 nm. Abstract : Broadband near infrared (NIR) emission materials are of interest for various applications including non-destructive biomedical imaging. In this work, ytterbium ions (Yb 3+ ) were successfully doped into Cs2 AgInCl6 :Cr 3+ (CAIC:Cr 3+ ) double perovskite single crystals (DPSCs) by a facile hydrothermal method. Under 365 nm excitation, the co-doped CAIC:Cr 3+, Yb 3+ DPSCs showed broad NIR emission ranging from 800 to 1400 nm, which spanned the NIR-I (700–900 nm) and NIR-II (1000–1700 nm) bio-windows, with an emission band at 1000 nm and a full-width at half maximum (FWHM) of 188 nm. It is found that Yb 3+ ion doping could effectively improve the photoluminescence (PL) performance of CAIC:Cr 3+ DPSCs. Compared to the photoluminescence quantum yield (PLQY) of 22.5% for the single doped CAIC:Cr 3+, the co-doped CAIC:Cr 3+, Yb 3+ DPSCs show a higher PLQY of ∼45%, which is attributed to the synergistic effect of reduced non-radiative recombination due to defect passivation and increase in crystallinity, and energy transfer (ET) of self-trapped excitons (STEs) to Cr 3+ . As a demonstration of applications, NIR pc-LEDs were fabricated by combining the as-synthesized NIR-emitting phosphor CAIC:Cr 3+, Yb 3+ with InGaN UV chips ( λ em = 365 nm) and used to image veins in a palm and for night vision using a NIR camera. The results suggest that the synthesized CAIC:Cr 3+, Yb 3+ DPSCs have great potential in biological applications.