通过三氟甲基 (-CF3) 调节的高稳定性和防潮单组分白色钙钛矿磷光体,The Journal of Physical Chemistry Letters

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通过三氟甲基 (-CF3) 调节的高稳定性和防潮单组分白色钙钛矿磷光体
The Journal of Physical Chemistry Letters ( IF 4.8 ) Pub Date : 2022-07-20 , DOI: 10.1021/acs.jpclett.2c01868
Weihui Bi ₁ , Zisheng Wang ₁ , Hanming Li ₁ , Yilong Song ₁ , Xiaoting Liu ₁ , Yingqi Wang ₁ , Chengda Ge ₁ , Anran Wang ₁ , Yifei Kang ₁ , Yang Yang ₁ , Bao Li ₁ , Qingfeng Dong ₁

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卤化物钙钛矿正在成为白光固态照明的有希望的候选者。尽管如此，仍然存在高水稳定性、可调色温和高光致发光量子产率（PLQY）的挑战。在此，我们报道了疏水、吸电子三氟甲基 (-CF ₃ ) 改性的苯乙胺溴化铅 (PEA ₂ PbBr ₄ ) 在水中具有 > 2 个月的超高稳定性，并且宽带白光发射由自陷激子说明到协调分子振动、晶格畸变和静电相互作用的激子-声子耦合。特别是，由 Mn ²⁺掺杂后，发光颜色可以从冷色（10237 K）调到暖色（2406 K），PLQY大大提高，≤87.93%。此外，钙钛矿还具有优异的显色指数（最高为 94）。进一步组装了具有惊人 CIE 1931 坐标 (0.33, 0.32) 的单组分白光发光二极管，在 50 mA 时的亮度为 471.5 cd m ^–2，并且在 > 2 个月后具有良好的长期运行稳定性。这项对具有高质量白光发射的高效稳定钙钛矿的研究将为固态照明开辟新的机遇。

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Highly Stable and Moisture-Immune Monocomponent White Perovskite Phosphor by Trifluoromethyl (-CF3) Regulation

Halide perovskites are emerging as promising candidates for white light solid state lighting. Nevertheless, there are still challenges of a high water stability, a tunable color temperature, and a high photoluminescence quantum yield (PLQY). Herein, we report hydrophobic, electron-withdrawing trifluoromethyl (-CF₃)-modified phenethylamine lead bromide (PEA₂PbBr₄) with ultrahigh stability in water for >2 months, and the broadband white light emission is illustrated by self-trapped excitons attributed to exciton–phonon coupling that coordinate molecular vibration, lattice distortion, and electrostatic interaction. In particular, by Mn²⁺ doping, the emission color can be tuned from cold (10237 K) to warm (2406 K), and a greatly enhanced PLQY of ≤87.93% can be achieved. Furthermore, the perovskites also possess an excellent color rendering index (the highest is 94). A monocomponent white light-emitting diode with amazing CIE 1931 coordinates of (0.33, 0.32) is further assembled, demonstrating a luminance of 471.5 cd m^–2 at 50 mA and good long-term operation stability after >2 months. This study of highly efficient and stable perovskites with high-quality white light emission will open up new opportunities in solid state lighting.

更新日期：2022-07-20

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