Double perovskite Cs2AgInCl6:Cr3+: broadband and near-infrared luminescent materials. Issue 12 (29th October 2019)

• Record Type: Journal Article
• Authors: Zhao, Fangyi; Song, Zhen; Zhao, Jing; Liu, Quanlin
• Is Part Of: Inorganic chemistry frontiers. Volume 6:Issue 12(2019)
• Page Start: 3621
• Page End: 3628
• Publication Date: 2019-10-29
• Subjects: Chemistry, Inorganic -- Periodicals; 546.05
• DOI: 10.1039/c9qi00905a
• Languages: English
• ISSNs: 2052-1553

Abstract

Abstract : A Cr 3+ -doped halide double perovskite Cs2 AgInCl6 :Cr 3+ is first reported which exhibits a broad near-infrared emission ranging from 850 to 1350 nm centered at 1010 nm with a FWHM of 180 nm. Abstract : Searching for high performance and broader applications of inorganic halide perovskites has drawn extensive attention. In this work, a Cr 3+ -doped halide perovskite, Cs2 AgInCl6 :Cr 3+, which exhibits broadband near-infrared (NIR) emission is first obtained via the traditional high temperature solid-state reaction. A broad emission band ranging from 850 to 1350 nm centered at 1010 nm with a full-width at half-maximum (FWHM) of 180 nm is assigned to the spin-allowed 4 T2 → 4 A2 transition of octahedrally coordinated Cr 3+ ions in a very weak crystal-field environment. The excitation bands centered at 353, 565 and 800 nm can be attributed to the absorption of the Cs2 AgInCl6 host, the Cr 3+ d–d transitions of 4 A2 → 4 T1 and 4 A2 → 4 T2, respectively. Upon 760 nm excitation, the photoluminescence quantum yield (PLQY) of Cs2 AgIn0.9 Cl6 :0.1Cr 3+ is about ∼22.03%. Cs2 AgInCl6 :Cr 3+ phosphors with such broadband NIR emission have potential in phosphor converted light emitting diodes (pc-LEDs) which have applications in bioimaging and biomonitoring.