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High Quantum Yield Blue Emission from Lead-Free Inorganic Antimony Halide Perovskite Colloidal Quantum Dots
ACS Nano ( IF 15.8 ) Pub Date : 2017-09-11 00:00:00 , DOI: 10.1021/acsnano.7b04683 Jian Zhang 1 , Ying Yang 1 , Hui Deng 1 , Umar Farooq 1 , Xiaokun Yang 1 , Jahangeer Khan 1 , Jiang Tang 1 , Haisheng Song 1
ACS Nano ( IF 15.8 ) Pub Date : 2017-09-11 00:00:00 , DOI: 10.1021/acsnano.7b04683 Jian Zhang 1 , Ying Yang 1 , Hui Deng 1 , Umar Farooq 1 , Xiaokun Yang 1 , Jahangeer Khan 1 , Jiang Tang 1 , Haisheng Song 1
Affiliation
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Colloidal quantum dots (QDs) of lead halide perovskite have recently received great attention owing to their remarkable performances in optoelectronic applications. However, their wide applications are hindered from toxic lead element, which is not environment- and consumer-friendly. Herein, we utilized heterovalent substitution of divalent lead (Pb2+) with trivalent antimony (Sb3+) to synthesize stable and brightly luminescent Cs3Sb2Br9 QDs. The lead-free, full-inorganic QDs were fabricated by a modified ligand-assisted reprecipitation strategy. A photoluminescence quantum yield (PLQY) was determined to be 46% at 410 nm, which was superior to that of other reported halide perovskite QDs. The PL enhancement mechanism was unraveled by surface composition derived quantum-well band structure and their large exciton binding energy. The Br-rich surface and the observed 530 meV exciton binding energy were proposed to guarantee the efficient radiative recombination. In addition, we can also tune the inorganic perovskite QD (Cs3Sb2X9) emission wavelength from 370 to 560 nm via anion exchange reactions. The developed full-inorganic lead-free Sb-perovskite QDs with high PLQY and stable emission promise great potential for efficient emission candidates.
中文翻译：
无铅无机卤化锑钙钛矿胶体量子点的高量子产率蓝发射
卤化钙钛矿的胶体量子点（QDs）由于其在光电应用中的卓越性能最近受到了广泛的关注。然而，它们的广泛应用受到有毒铅元素的阻碍，这对环境和消费者都不友好。在本文中，我们利用三价锑（Sb 3+）取代二价铅（Pb 2+）来合成稳定且明亮的Cs 3 Sb 2 Br 9QD。通过改良的配体辅助再沉淀策略制备了无铅全无机量子点。经测定，在410 nm处的光致发光量子产率（PLQY）为46％，优于其他报道的卤化物钙钛矿QD。通过表面成分衍生的量子阱能带结构及其大的激子结合能揭示了PL增强机理。提出了富Br的表面和观察到的530 meV激子结合能，以确保有效的辐射复合。此外，我们还可以调整无机钙钛矿QD（CS 3的Sb 2 X 9）发射波长从370至560nm经由阴离子交换反应。具有高的PLQY和稳定的排放的已开发的全无机无铅Sb-钙钛矿QD有望成为高效排放候选物的巨大潜力。
更新日期：2017-09-11
中文翻译：
无铅无机卤化锑钙钛矿胶体量子点的高量子产率蓝发射
卤化钙钛矿的胶体量子点（QDs）由于其在光电应用中的卓越性能最近受到了广泛的关注。然而，它们的广泛应用受到有毒铅元素的阻碍，这对环境和消费者都不友好。在本文中，我们利用三价锑（Sb 3+）取代二价铅（Pb 2+）来合成稳定且明亮的Cs 3 Sb 2 Br 9QD。通过改良的配体辅助再沉淀策略制备了无铅全无机量子点。经测定，在410 nm处的光致发光量子产率（PLQY）为46％，优于其他报道的卤化物钙钛矿QD。通过表面成分衍生的量子阱能带结构及其大的激子结合能揭示了PL增强机理。提出了富Br的表面和观察到的530 meV激子结合能，以确保有效的辐射复合。此外，我们还可以调整无机钙钛矿QD（CS 3的Sb 2 X 9）发射波长从370至560nm经由阴离子交换反应。具有高的PLQY和稳定的排放的已开发的全无机无铅Sb-钙钛矿QD有望成为高效排放候选物的巨大潜力。
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