| 초록 |
Recently, the wide color gamut (WCG) of the white LEDs is an important issue for more realistic colour of display. Therefore, many researches about high colour purity luminescence material have been studying. Organic-inorganic halide perovskite (OIP) nanocrystals (NCs) have attained great attention as the candidates for optoelectronic devices due to their outstanding optical properties such as the wide color tunability, narrow full width at half maximum (FWHM) of emission, high photoluminescence quantum yields (PLQYs) and these low economic and energetic costs. However, because of the stability issues to moisture, temperature, light and air environment, all-inorganic CsPbX3 (X=Cl, Br, I) NCs have been reported to further improve a stability. In this study, we successfully synthesized the high color purity perovskite NCs with enhanced PLQYs of 99.7% and a narrow FWHM of 21 nm by substituting the Cs cations with Rb cations. Subsequently, (Cs0.4Rb0.6)PbBr3 NCs was integrated with mesoporous silica (m-SiO2) matrix. The m-SiO2 efficiently improved the thermal- and photo- stability of the perovskite NCs. Finally, the down-conversion white LEDs designed by the perovskite NCs@m-SiO2 composite with red-emitting K2SiF6:Mn4+ phosphor on blue InGaN LED was characterized. Acknowledgement This research was financially supported by the Ministry of Trade, Industry and Energy(MOTIE) and Korea Institute for Advancement of Technology(KIAT) through the International Cooperative R&D program(P0006844_Development of color conversion nanocrystal luminescence materials for next generation display). |
