Journal
CHEMICAL ENGINEERING JOURNAL
Volume 433, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2021.134079
Keywords
Anti-thermal-quenching; w-LEDs; Spectral-tuning; Cyan green-emitting; Hexaaluminate
Categories
Funding
- National Natural Science Foundation of China [51974123, 21903023]
- Distinguished Youth Foundation of Hunan Province [2020JJ2018]
- Key R&D projects in Hunan Province [2020WK2016, 2020SK2032, 2021SK2047, 2022NK2044]
- Natural Sciences Foundation of Hunan Province, China [2021JJ40261]
- Hunan High Level Talent Gathering Project [2019RS1077, 2020RC5007]
- Scientific Research Fund of Hunan Provincial Education Department [19C0903]
- Natural Sciences Foundation of Hunan Agricultural University, China [19QN11]
- Hunan Provincial Key Laboratory of Crop Germplasm Innovation and Resource Utilization Science Foundation [19KFXM12]
Ask authors/readers for more resources
This study reports emission-tunable solid solution phosphors with superior luminescence properties and anti-thermal-quenching behavior. Doping Ga3+ ions into the phosphor matrix enhances emission and enables tuning from green to cyan. w-LEDs fabricated using these phosphors show superior color rendering index, indicating potential for high-power w-LED applications in the future.
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 KAl11-xGaxO17:Mn2+ (x = 0-11), with superior luminescence properties and anti-thermal-quenching behavior is reported. KAl11O17:Mn2+ 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 degrees C) due to the thermal induced electron detrapping. Interestingly, doping Ga3+ 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 Ga3+ substituting could stabilize the luminescence (nearly zero-thermal-quenching) of phosphor even at the elevated temperature range of 25-250 degrees 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 KAl11O17:Mn2+ as cyan/green emitting component show superior color rendering index (improved from 85.5 to 96.3), indicating these Mn2+-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.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available