https://scholars.lib.ntu.edu.tw/handle/123456789/576256
標題: | CH3NH3Pb1- xCo xBr3-2 xCl2 xPerovskite Quantum Dots for Wide-Color Backlighting | 作者: | Singh R.K CHUNG-HSIN LU |
關鍵字: | Chlorine compounds; Color; Density functional theory; Energy gap; Esters; Light emitting diodes; Metal ions; Nanocrystals; Perovskite; Semiconductor quantum dots; Transition metals; Cobalt chlorides; Doping concentration; Emission wavelength; Photoluminescence quantum yields; Poly(methyl methacrylate) (PMMA); Research communities; White light emitting diodes; Wide color gamut; Cobalt compounds | 公開日期: | 2021 | 卷: | 4 | 期: | 1 | 起(迄)頁: | 717-728 | 來源出版物: | ACS Applied Nano Materials | 摘要: | In recent years, perovskite quantum dots (PQDs) with the incorporation of transition-metal ions for reducing toxicity and enhancing stability have been in a research hotspot. However, the PQDs containing transition-metal ions are quite unstable and display low photoluminescence quantum yields (PLQYs), owing to the existence of defects. Herein, we have endeavored to introduce simultaneous cation and anion exchange with cobalt and chloride ions into the host CH3NH3Pb1-xCoxBr3-2xCl2x PQDs followed by matrix encapsulation via poly(methyl methacrylate) (PMMA) as a favorable approach to stabilize PQDs with improved PLQY. We have utilized cobalt chloride as the precursor for doping ions. The emission wavelength can be regulated from green to cyan color with the increase in doping concentration without negotiating on color quality, which is believed to be the modification of band gap and corresponding electron density estimated from the density functional theory. A high PLQY of 95% is observed even after the incorporation of cobalt and chloride ions into host PQDs. We demonstrate white light-emitting diode (LED) prototypes for backlight applications using a PQDs/PMMA composite on a blue LED chip, which exhibits excellent stability toward an ambient and robust atmosphere and provides a wide-color gamut of 124% of the NTSC standard. This research paves a way for the research community to synthesize highly efficient, color-tunable PQDs for wide-color backlighting applications. ? |
URI: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-85099807710&doi=10.1021%2facsanm.0c03019&partnerID=40&md5=4c2581e6228e81aab158151a7ac4a492 https://scholars.lib.ntu.edu.tw/handle/123456789/576256 |
ISSN: | 25740970 | DOI: | 10.1021/acsanm.0c03019 |
顯示於: | 化學工程學系 |
在 IR 系統中的文件,除了特別指名其著作權條款之外,均受到著作權保護,並且保留所有的權利。