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Lead-free, stable, high-efficiency (52%) blue luminescent FA3Bi2Br9 perovskite quantum dots.
Nanoscale Horizons ( IF 8.0 ) Pub Date : 2020-03-02 , DOI: 10.1039/c9nh00685k Yalong Shen 1 , Jun Yin 2 , Bo Cai 1 , Ziming Wang 1 , Yuhang Dong 1 , Xiaobao Xu 1 , Haibo Zeng 1
Nanoscale Horizons ( IF 8.0 ) Pub Date : 2020-03-02 , DOI: 10.1039/c9nh00685k Yalong Shen 1 , Jun Yin 2 , Bo Cai 1 , Ziming Wang 1 , Yuhang Dong 1 , Xiaobao Xu 1 , Haibo Zeng 1
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Lead halide perovskites are promising candidates as next-generation emitting materials for lighting and displays due to their superior properties. However, the toxicity of lead content severely limits their practical applications. Although lead-free Sn-based and Bi-based perovskites (Cs3Bi2Br9, MA3Bi2Br9) are reported, they all suffer from low photoluminescence quantum yield (PLQY). Here, we report the synthesis of lead-free FA3Bi2Br9 perovskite quantum dots (QDs) and their optical characterization. Through a facile ligand-assisted solution process, the as-synthesized FA3Bi2Br9 QDs exhibit a bright blue emission at 437 nm with a high PLQY of 52%. As to the origins, the observed high exciton binding energy (274.6 meV), direct bandgap nature and low defect density are proposed to guarantee the exciton generation and efficient radiative recombination. Besides, the FA3Bi2Br9 QDs show a good air stability and ethanol stability. A lead-free perovskite blue light-emitting diodes (LED) was successfully fabricated by combining FA3Bi2Br9 QDs/PS composites with a UV light chip. Our results highlight the potential of lead-free perovskites for applications in light-emitting devices.
中文翻译：
无铅，稳定，高效（52％）的蓝色发光FA3Bi2Br9钙钛矿量子点。
卤化钙钛矿具有优异的性能，因此有望成为照明和显示器的下一代发光材料。但是，铅含量的毒性严重限制了其实际应用。尽管据报道无铅锡基和铋基钙钛矿（Cs3Bi2Br9，MA3Bi2Br9），但它们都遭受着低光致发光量子产率（PLQY）的困扰。在这里，我们报告无铅FA3Bi2Br9钙钛矿量子点（QDs）的合成及其光学表征。通过简便的配体辅助溶液法，合成后的FA3Bi2Br9 QD在437 nm处显示亮蓝色发射，PLQY高达52％。关于起源，提出了观察到的高激子结合能（274.6 meV），直接带隙性质和低缺陷密度，以保证激子的产生和有效的辐射重组。此外，FA3Bi2Br9量子点显示出良好的空气稳定性和乙醇稳定性。通过将FA3Bi2Br9 QDs / PS复合材料与紫外光芯片相结合，成功制造了无铅钙钛矿蓝色发光二极管（LED）。我们的结果突出了无铅钙钛矿在发光器件中的应用潜力。
更新日期：2020-03-02
中文翻译：
无铅，稳定，高效（52％）的蓝色发光FA3Bi2Br9钙钛矿量子点。
卤化钙钛矿具有优异的性能，因此有望成为照明和显示器的下一代发光材料。但是，铅含量的毒性严重限制了其实际应用。尽管据报道无铅锡基和铋基钙钛矿（Cs3Bi2Br9，MA3Bi2Br9），但它们都遭受着低光致发光量子产率（PLQY）的困扰。在这里，我们报告无铅FA3Bi2Br9钙钛矿量子点（QDs）的合成及其光学表征。通过简便的配体辅助溶液法，合成后的FA3Bi2Br9 QD在437 nm处显示亮蓝色发射，PLQY高达52％。关于起源，提出了观察到的高激子结合能（274.6 meV），直接带隙性质和低缺陷密度，以保证激子的产生和有效的辐射重组。此外，FA3Bi2Br9量子点显示出良好的空气稳定性和乙醇稳定性。通过将FA3Bi2Br9 QDs / PS复合材料与紫外光芯片相结合，成功制造了无铅钙钛矿蓝色发光二极管（LED）。我们的结果突出了无铅钙钛矿在发光器件中的应用潜力。
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