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Perovskite Quantum Dots and Their Application in Light‐Emitting Diodes
Author(s) -
Wang HungChia,
Bao Zhen,
Tsai HsinYu,
Tang AnCih,
Liu RuShi
Publication year - 2018
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.201702433
Subject(s) - materials science , backlight , perovskite (structure) , quantum dot , photoluminescence , optoelectronics , formamidinium , diode , light emitting diode , nanotechnology , chemical engineering , liquid crystal display , engineering
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 3 PQDs, PQDs with organic–inorganic mixed cations, divalent cation doped colloidal CsPb 1− x M x Br 3 PQDs (M = Sn 2+ , Cd 2+ , Zn 2+ , Mn 2+ ) featuring partial cation exchange, and heterovalent cation doped into PQDs (Bi 3+ ). 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.