10.1021/acsami.9b03528.s001
Wenli Zhou
Wenli
Zhou
Ren-Hong Wang
Ren-Hong
Wang
Lichang Yin
Lichang
Yin
Jun Chen
Jun
Chen
Chaochin Su
Chaochin
Su
Xianran Xing
Xianran
Xing
Ru-Shi Liu
Ru-Shi
Liu
Alcohol-Guided
Growth of Two-Dimensional Narrow-Band
Red-Emitting K<sub>2</sub>TiF<sub>6</sub>:Mn<sup>4+</sup> for White-Light-Emitting
Diodes
American Chemical Society
2019
prototype phosphor-converted LED
photoluminescence quantum efficiency
Mn
alcohol-assisted coprecipitation route
1- propanol
efficacy
K 2 TiF 6 MSs
Two-Dimensional Narrow-Band Red-Emitting K 2 TiF 6
morphology-optimal KTFM MSs
red-emitting K 2 TiF 6
QE
2019-05-09 00:00:00
Journal contribution
https://acs.figshare.com/articles/journal_contribution/Alcohol-Guided_Growth_of_Two-Dimensional_Narrow-Band_Red-Emitting_K_sub_2_sub_TiF_sub_6_sub_Mn_sup_4_sup_for_White-Light-Emitting_Diodes/8159096
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 K<sub>2</sub>TiF<sub>6</sub>:Mn<sup>4+</sup> (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 K<sub>2</sub>TiF<sub>6</sub> (001) surface. The photoluminescence
quantum efficiency (QE) of Mn<sup>4+</sup>-activated K<sub>2</sub>TiF<sub>6</sub> 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 (<i>R</i><sub>a</sub> = 91, <i>R</i>9 = 79) and high luminous efficacy (LE = 156 lm/w).