| 초록 |
CsPbX3 nanocrystals exhibit superior optoelectronic properties by providing wide photoluminescent quantum efficiency (PLQY), narrow emission bandwidth, long carrier diffusion length, wide emission spectrum tunability and short luminescence lifetime. It is also a material that can make new optoelectronic devices such as light emitting diodes (LEDs) and solar cell. Hybrid organic-inorganic halide perovskite materials are semiconductors with good performance in LED manufacturing, but lead-containing materials are not stable. This has led to the need for non-lead perovskite materials with similar photoelectric properties. Single crystals of organically templated chiral bromobismuthates(Ⅲ), [((R)- C8H12N)4][Bi2I10](Bi-perovskite) have been grown for the first time via a slow evaporation method. Each of the chiral molecular compound consists of (R)-1-phenylethylammonium ([C8H12N]+) cations and [Bi2I10]4- anions.The newly prepared Bi3+-based organic-inorganic hybrid materials show optical bandgap of ca. 2.88 eV. The resultant LEDs displayed bright green emission, with a current efficiency and external quantum efficiency of 9.22 cd A−1 and 2.64%, respectively. The LEDs is composed of poly (2,3-dihydrothieno-1,4-dioxin) -poly (styrene sulfonate) / N,N′-Bis(naphthalen-1-yl)-N,N′-bis(phenyl)benzidine / Bi-perovskite / bathocuproine / Tris- (8-hydroxyquinolinato) aluminum) / lithium fluoride / Al structure. The generated LEDs showed green emission with a maximum luminance of 502.96 cd / m2 and a current efficiency of 0.29 cd / A. This shows light emitting diodes based on Pb-free perovskite synthesized using the slow evaporation method. Finally, Bi-perovskite is a non-lead perovskite, which is able to solve the environmental and stability problems of CsPbX3 nanocrystals. |
