One- and Two-Photon Excited Photoluminescence and Suppression of Thermal Quenching of CsSnBr₃ Microsquare and Micropyramid

Abstract

Thermal photoluminescence (PL) quenching is fundamentally important for perovskite optoelectronic applications. Herein, we investigated PL characteristics of CsSnBr3 microsquares and micropyramids synthesized by chemical vapor deposition (CVD) and their PL quenching behavior at high temperature. These microstructures have favorable PL performances in ambient atmosphere. Under two-photon excitation, we observed whispering gallery modes (WGMs) in microsquares and amplified spontaneous emission (ASE) in micropyramids. Reversible PL losses due to thermal effect were observed for both samples. Monotonic blue shifts in PL emission upon temperature increase suggest a band gap widening associated with an emphanisis effect. Temperature-dependent spectral line width analysis reveals that a line width broadening is attributed to the dominant electron–longitudinal optical phonon interaction. The estimated activation energy of thermally assisted nonradiative recombination for CsSnBr3 microsquares and micropyramids is over 310 meV by the Arrhenius equation, which is higher than CsPbBr3. These results prove that CsSnBr3 exhibits better thermal stability than Pb-based perovskites.

Temperature-dependent photoluminescence of lead-free cesium tin halide perovskite microplates

“…The development of tin halide perovskites has been proved to be one of the most promising approaches because the replacement of Pb 2+ by Sn 2+ with a very close ionic radius can form stable perovskite structures and maintain similar electronic and band structures. [17,[23][24][25] For example, all-inorganic cesium tin halide perovskites CsSnX 3 (X = Cl, Br, and I) have been reported to have excellent optoelectronic properties, such as high PL quantum efficiency, [26] tunable narrow-band PL emission, [24,27,28] high absorption coefficient, [25,29] low exciton binding energy, [24,30,31] high carrier mobility, [31] amplified spontaneous emission characteristic, [32,33] and narrower bandgaps compared with the lead analogues. [34,35] Therefore, most of the optoelectronic applications achieved by lead halide perovskites have also been demonstrated by CsSnX 3 , including solar cells, [23,34,36] LEDs, [30] lasers, [32] and photodetectors.…”

Multimodal Luminescent Low-Dimension Cs2ZrCl6:xSb3+ Crystals for White Light-Emitting Diodes and Information Encryption

“…31,49,50 In order to ensure their optical applications, the stability of Cs 2 ZrCl 6 :xSb 3+ crystals is a key parameter. Compared with other perovskite materials (CsSnBr 3 , 51 CsCu 2 I 3 , 52,53 and Cs 3 Cu 2 I 5 54 ), Cs 2 ZrCl 6 :xSb 3+ crystals are difficult to oxidize due to stable valence states of Zr 4+ and Sb 3+ ions. As shown in Figure S8a, thermogravimetry (TG) measurements show that Cs 2 ZrCl 6 :xSb 3+ powders have a high decomposition temperature (600 °C) and a weight loss of 24.55% at 700 °C, indicating outstanding thermal stability.…”

Ethanol-assisted synthesis of two-dimensional tin(ii) halide perovskite single crystals for amplified spontaneous emission

“…21 Although low-threshold amplified spontaneous emission (ASE) and lasing from 400 to 800 nm have been demonstrated using lead halide perovskite, 2,6,7,[22][23][24][25][26] only a few reports have been published on tin(II)-based halide perovskite lasing, which were all realized in their 3D counterparts. 16,[27][28][29] They are sensitive to water and oxygen, which leads to the oxidation of tin(II) to tin(IV) and degradation of perovskites. In 2016, Xing et al reported CsSnI 3 thin-film near-infrared (NIR) lasing in nitrogen, where SnF 2 as an antioxidant was essential for achieving laser operation.…”