摘要
The use of red phosphors with low light-scattering loss could improve the luminous efficacy and color rendering of white-light-emitting diodes (LEDs). Thus, the discovery of such phosphors is highly desired. In this work, high-efficiency two-dimensional red-emitting K2TiF6:Mn4+ (KTFM) were synthesized via an alcohol-assisted coprecipitation route. The synergistic effects of 1-propanol and hydrofluoric acid on the growth of KTFM microsheets (MSs) were studied through the first-principles calculations, which revealed that 1-propanol promoted the growth of KTFM MSs by preferentially adsorbing on the H-terminated K2TiF6 (001) surface. The photoluminescence quantum efficiency (QE) of Mn4+-activated K2TiF6 MSs was highly related to their size and thickness. The morphology-optimal KTFM MSs presented high internal QE (>90%), external QE (>71%), and thermal quenching temperature (102% at 150 °C relative to that at 25 °C). A prototype phosphor-converted LED with KTFM as the red-emitting component showed excellent color rendition (Ra = 91, R9 = 79) and high luminous efficacy (LE = 156 lm/w).
原文 | 英語 |
---|---|
頁(從 - 到) | 20143-20149 |
頁數 | 7 |
期刊 | ACS Applied Materials and Interfaces |
卷 | 11 |
發行號 | 22 |
DOIs | |
出版狀態 | 已出版 - 05 06 2019 |
對外發佈 | 是 |
文獻附註
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