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 ${\mathrm{Cs}}_2{\mathrm{SnCl}}_6$ (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 [${\mathrm{Bi}}_{\mathrm{Sn}}+{\mathrm{V}}_{\mathrm{Cl}}$] 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 ($S_R$) and absolute sensitivity ($S_A$) values obtained are $3.82\%{\mathrm{K}}^{-1}$ and $5.11\mathrm{ns}·{\mathrm{K}}^{-1}$, 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.

中文翻译：

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通过 Bi 和 Sb 共掺杂调节 Cs2SnCl6 荧光粉微晶的发光特性和光学测温

尽管卤化铅钙钛矿具有高光致发光（PL）效率和可调发射，但其毒性和不稳定性严重限制了其在照明中的商业应用。这里，无铅铋 (Bi) 和锑 (Sb) 共掺杂${\mathrm{CS}}_2{\mathrm{氯化锡}}_6$(BSCSC) 微晶 (MCs) 通过溶剂热法成功制备。PL光谱由双发射带组成，峰值在485和650 nm，其相对强度可以分别通过Bi和Sb进料含量的变化进行调节。由于声子-电子相互作用，PL 强度随着温度在 80-260 K 范围内升高而增强。然后，非辐射跃迁增强至 380 K，这导致 PL 强度降低。同时，结合时间分辨 PL，可以得出结论，485 nm 处的发射峰归因于 [${双}_{锡}+{\mathrm{伏}}_{氯}$] 作为具有数百纳秒寿命的发光中心，650 nm 处的发射峰归因于微秒级自陷激子。相对灵敏度的最大值（${秒}_{\mathrm{电阻}}$) 和绝对灵敏度 (${秒}_{\mathrm{一种}}$) 获得的值是 $3.82\%{\mathrm{钾}}^{-1}$ 和 $5.11\mathrm{纳秒}·{\mathrm{钾}}^{-1}$，据我们所知，这是第一次证明 BSCSC MCs 可以成为开发更好的光学温度测量的新型发光材料。白光发光二极管 (WLED) 是使用仅与 LED 芯片结合的 BSCSC MC 构建的，其颜色坐标为 (0.30, 0.37)。它为照明领域提供了一种无需添加额外商业荧光粉即可实现 WLED 的新方案。