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• W4200517704 endingPage "134079" @default.
• W4200517704 startingPage "134079" @default.
• W4200517704 abstract "• A green KAl 11-x Ga x O 17 :Mn 2+ phosphor with luminous intensity comparable to commercial YAG was prepared. • A rare single Mn 2+ -doped phosphor with anti-thermal-quenching characteristic (165.5 % at 275 °C). • A feasible strategy to adjust the spectral blue shift and thermal quenching resistance has been developed. • Phosphors could fill the cyan gap of traditional YAG lighting system to achieve high-quality lighting (R a = 96.3). Highly efficient cyan/green phosphors are identified as functional block to fulfill the cyan gap in emissive spectra of traditional white light emitting diodes (w-LEDs). Herein, a series of emission-tunable solid solution phosphors, namely KAl 11-x Ga x O 17 :Mn 2+ (x = 0–11), with superior luminescence properties and anti-thermal-quenching behavior is reported. KAl 11 O 17 :Mn 2+ dedicates green emission at 510 nm with a narrow full width at half maximum of 23.5 nm, and excellent thermal quenching resistance (130.4% at 150 °C) due to the thermal induced electron detrapping. Interestingly, doping Ga 3+ ions into this hexaaluminate matrix enables harvested phosphor with enhanced emission by 2.35 times, and achieves luminescence tuning from green to cyan. Moreover, such a Ga 3+ substituting could stabilize the luminescence (nearly zero-thermal-quenching) of phosphor even at the elevated temperature range of 25–250 °C. Based on the thermoluminescence (TL) analysis and density functional theory (DFT) calculations, this extraordinary phenomenon was reasonably assigned to the enhancement of photoionization effect and the detrapping of the captured electrons from shallow trap state. The w-LEDs fabricated by employing KAl 11-x Ga x O 17 :Mn 2+ as cyan/green emitting component show superior color rendering index (improved from 85.5 to 96.3), indicating these Mn 2+ -doped hexaaluminate phosphors may be candidates used for high-power w-LEDs in the future. This work opens up a new pathway to construct anti-thermal-quenching and spectra-tunable phosphors for optical applications." @default.
• W4200517704 created "2021-12-31" @default.
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• W4200517704 date "2022-04-01" @default.
• W4200517704 modified "2023-09-30" @default.
• W4200517704 title "Anti-thermal-quenching, color-tunable and ultra-narrow-band cyan green-emitting phosphor for w-LEDs with enhanced color rendering" @default.
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• W4200517704 doi "https://doi.org/10.1016/j.cej.2021.134079" @default.
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