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Exciton, Biexciton, and Hot Exciton Dynamics in CsPbBr3 Colloidal Nanoplatelets.
The Journal of Physical Chemistry Letters ( IF 4.8 ) Pub Date : 2019-12-27 , DOI: 10.1021/acs.jpclett.9b03282 Brener R C Vale 1, 2 , Etienne Socie 1 , Andrés Burgos-Caminal 1 , Jefferson Bettini 3 , Marco A Schiavon 2 , Jacques-E Moser 1
The Journal of Physical Chemistry Letters ( IF 4.8 ) Pub Date : 2019-12-27 , DOI: 10.1021/acs.jpclett.9b03282 Brener R C Vale 1, 2 , Etienne Socie 1 , Andrés Burgos-Caminal 1 , Jefferson Bettini 3 , Marco A Schiavon 2 , Jacques-E Moser 1
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Lead halide perovskites have emerged as promising materials for light-emitting devices. Here, we report the preparation of colloidal CsPbBr3 nanoplatelets (3 × 4 × 23 nm3) experiencing a strong quasi-one-dimensional quantum confinement. Ultrafast transient absorption and broadband fluorescence up-conversion spectroscopies were employed to scrutinize the carrier and quasiparticle dynamics and to obtain a full description of the spectroscopic properties of the material. An exciton binding energy of 350 meV, an absorption cross section at 3.2 eV of 5.0 ± 0.3 × 10-15 cm-2, an efficient biexciton Auger recombination lifetime of 9 ± 1 ps, and a biexciton binding energy of 74 ± 4 meV were determined. Moreover, a short-lived emission from hot excitons was observed, which is related to the formation of band-edge excitons. The time constant of both processes is 300 ± 50 fs. These results show that CsPbBr3 nanoplatelets are indeed quite promising for light-emitting technological applications.
中文翻译：
CsPbBr3胶态纳米血小板中的激子，双激子和热激子动力学。
卤化钙钛矿已经成为发光器件的有前途的材料。在这里，我们报告的CsPbBr3胶体纳米片（3×4×23 nm3）的制备经历了强烈的准一维量子约束。采用超快瞬态吸收和宽带荧光上转换光谱法仔细研究了载体和准粒子动力学，并获得了该材料光谱性质的完整描述。激子结合能为350 meV，3.2 eV的吸收截面为5.0±0.3×10-15 cm-2，有效的双激子俄歇复合寿命为9±1 ps，双激子结合能为74±4 meV。决定。此外，观察到热激子的短时发射，这与带边激子的形成有关。两个过程的时间常数均为300±50 fs。这些结果表明，CsPbBr3纳米血小板确实在发光技术应用中非常有前途。
更新日期：2019-12-29
中文翻译：
CsPbBr3胶态纳米血小板中的激子，双激子和热激子动力学。
卤化钙钛矿已经成为发光器件的有前途的材料。在这里，我们报告的CsPbBr3胶体纳米片（3×4×23 nm3）的制备经历了强烈的准一维量子约束。采用超快瞬态吸收和宽带荧光上转换光谱法仔细研究了载体和准粒子动力学，并获得了该材料光谱性质的完整描述。激子结合能为350 meV，3.2 eV的吸收截面为5.0±0.3×10-15 cm-2，有效的双激子俄歇复合寿命为9±1 ps，双激子结合能为74±4 meV。决定。此外，观察到热激子的短时发射，这与带边激子的形成有关。两个过程的时间常数均为300±50 fs。这些结果表明，CsPbBr3纳米血小板确实在发光技术应用中非常有前途。
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