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• Photonics Research
• Vol. 9, Issue 11, 11002182 (2021)
Shunfa Gong1, Ruirui Wu1, Sen Yang1, Lifang Wu1, Minmin Zhang1, Qiuju Han2, and Wenzhi Wu1、*
Author Affiliations
• 1School of Electronic Engineering, Heilongjiang University, Harbin 150080, China
• 2College of Arts and Sciences, Northeast Agricultural University, Harbin 150030, China
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Abstract

The toxicity and instability of lead halide perovskite seriously limit its commercial application in lighting, although it has high photoluminescence (PL) efficiency and adjustable emission. Here, lead-free bismuth (Bi) and antimony (Sb) codoped $Cs2SnCl6$ (BSCSC) microcrystals (MCs) are prepared successfully by a solvothermal method. The PL spectrum is composed of dual emission bands with the peak at 485 and 650 nm, of which relative intensity can be tunable through the change of Bi and Sb feeding contents, respectively. Because of the phonon–electron interaction, the PL intensity is enhanced as the temperature rises within the range of 80–260 K. Then, the nonradiative transition is intensified until 380 K, which results in decrease in PL intensity. Simultaneously, combining with time-resolved PL, it is concluded that the emission peak at 485 nm is attributed to the [$BiSn+VCl$] as the luminescent centers with the lifetime of hundreds of nanoseconds, and the emission peak at 650 nm is attributed to microsecond-timescale self-trapped excitons. The maximum values of relative sensitivity ($SR$) and absolute sensitivity ($SA$) values obtained are $3.82% K-1$ and $5.11 ns ·K-1$, which for the first time to our knowledge demonstrate that BSCSC MCs can be novel luminescent materials for developing better optical thermometry. White-light-emitting diodes (WLEDs) are constructed using BSCSC MCs only combined with an LED chip, the Commission Internationale de L’Eclairage color coordinates of which are (0.30, 0.37). It provides a novel scheme for the lighting field to realize WLEDs without adding additional commercial phosphors.

1. INTRODUCTION

In recent years, organic-inorganic, and the subsequent all-inorganic lead halide perovskites [$APbX3$, $A=CH3NH3+$, $CH(NH2)2+$, or $Cs+$, $X=Cl−$, $Br−$, or $I−$] have attracted the attention of many researchers because of their unique optical properties, such as narrow full width at half-maximum (FWHM), high photoluminescence quantum yield (PLQY), wide color gamut, tunable emission, and excellent optoelectronic properties [1,2]. Therefore, researchers make use of the excellent optoelectronic properties of lead halide perovskite to prepare a large-area perovskite battery [3,4]. Taking advantage of the excellent optical gain and high emission efficiency of lead halide perovskite, high-quality $CsPbBr3$ nanowire plasmonic lasers have been fabricated successfully by chemical vapor deposition [5]. By making use of the tunable emission of lead halide perovskite, perovskite LEDs are prepared successfully [6,7]. However, the toxicity of lead will cause irreversible damage to human intelligence, especially for the brains of young children. Meanwhile, lead halide perovskite shows poor stability to oxygen, water, or high temperature, which seriously limits its commercial application prospects.

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Shunfa Gong, Ruirui Wu, Sen Yang, Lifang Wu, Minmin Zhang, Qiuju Han, Wenzhi Wu. Tuning the luminous properties and optical thermometry of Cs2SnCl6 phosphor microcrystals via Bi and Sb codoping[J]. Photonics Research, 2021, 9(11): 11002182