Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 844, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2020.155875
Keywords
Rb2Bi(PO4)(WO4):Eu3+; Red-emitting; High quantum yield; Negligible thermal quenching
Categories
Funding
- Open Project Program of Key Laboratory of Functional Crystals and Laser Technology, TIPC, CAS [FCLT201704]
- Training Programs of Innovation and Entrepreneurship for Undergraduates of Shandong Province [201910448036]
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The high-performance red-emitting phosphors are strongly demanded as the next generation solid state lighting materials. Benefitting from the favorable accommodation capacity of polyanions and high charge transfer energy state in the structure, the pure red-emitting Rb2Bi(PO4)(WO4):Eu3+ (RBPWO:Eu3+) materials with negligible thermal quenching and high quantum yield were synthesized. RBPWO:Eu3+ has high absolute quantum yields of 88.1% and exceptional thermal stability of 98.6% integral retention at 423 K relative to the initial value at 298 K. Additionally, affected by the low symmetry crystalline -field of D-2h, the title phosphors exhibit intense absorption band peaking at 394 nm and pure red light with the color CIE values (0.6482, 0.3515). The white light-emitting diode (w-LED) device fabricated from the title material exhibits low correlated color temperature (4000 K), high color rendering index (R-a = 90) and moderate luminous efficiency (18.07 lm/W) in the preliminary experiment. The present work indicates that the RBPWO:Eu3+ phosphors are promising red components for the near ultraviolet light excited w-LEDs. (C) 2020 Elsevier B.V. All rights reserved.
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