Wang Hung-Chia, Bao Zhen, Tsai Hsin-Yu, Tang An-Cih, Liu Ru-Shi
Department of Chemistry, National Taiwan University, Taipei, 106, Taiwan.
Department of Mechanical Engineering and Graduate, Institute of Manufacturing Technology, National Taipei University of Technology, Taipei, 106, Taiwan.
Small. 2018 Jan;14(1). doi: 10.1002/smll.201702433. Epub 2017 Nov 30.
Perovskite quantum dots (PQDs) attract significant interest in recent years because of their unique optical properties, such as tunable wavelength, narrow emission, and high photoluminescence quantum efficiency (PLQY). Recent studies report new types of formamidinium (FA) PbBr PQDs, PQDs with organic-inorganic mixed cations, divalent cation doped colloidal CsPb M Br PQDs (M = Sn , Cd , Zn , Mn ) featuring partial cation exchange, and heterovalent cation doped into PQDs (Bi ). These PQD analogs open new possibilities for optoelectronic devices. For commercial applications in lighting and backlight displays, stability of PQDs requires further improvement to prevent their degradation by temperature, oxygen, moisture, and light. Oxygen and moisture-facilitated ion migration may easily etch unstable PQDs. Easy ion migration may result in crystal growth, which lowers PLQY of PQDs. Surface coating and treatment are important procedures for overcoming such factors. In this study, new types of PQDs and a strategy of improving their stabilities are introduced. Finally, this paper discusses future applications of PQDs in light-emitting diodes.
近年来，钙钛矿量子点（PQDs）因其独特的光学性质而备受关注，如波长可调、发射窄和高光致发光量子效率（PLQY）。最近的研究报道了新型的甲脒（FA）PbBr量子点、具有有机-无机混合阳离子的量子点、具有部分阳离子交换特性的二价阳离子掺杂胶体CsPbMBr量子点（M = Sn、Cd、Zn、Mn）以及掺杂到量子点中的异价阳离子（Bi）。这些量子点类似物为光电器件开辟了新的可能性。对于照明和背光显示器的商业应用，量子点的稳定性需要进一步提高，以防止其因温度、氧气、水分和光照而降解。氧气和水分促进的离子迁移可能很容易蚀刻不稳定的量子点。容易的离子迁移可能导致晶体生长，从而降低量子点的PLQY。表面涂层和处理是克服这些因素的重要步骤。在本研究中，介绍了新型量子点及其提高稳定性的策略。最后，本文讨论了量子点在发光二极管中的未来应用。
