Deep blue, cyan, orange-red, and white multicolor emissions generated by Bi3+/Eu3+ activated KBaYSi2O7 luminescent materials for white light-emitting diodes. Issue 10 (15th May 2023)

• Record Type: Journal Article
• Authors: Kong, Hanxiao; Jia, Guang; Li, Huilin; Meng, Zhaoxin; Zhang, Ning; Zhang, Cuimiao
• Is Part Of: Ceramics international. Volume 49:Issue 10(2023)
• Page Start: 15320
• Page End: 15332
• Publication Date: 2023-05-15
• Subjects: KBaYSi2O7:Bi3+/Eu3+ phosphors -- Multicolor emissions -- Color-tunable luminescence -- Energy transfer -- White light-emitting diodes; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2023.01.116
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: A variety of Bi 3+ and/or Eu 3+ doped KBaYSi2 O7 phosphors with deep blue, cyan, orange-red, and white light multicolor emissions have been fabricated by a Pechini sol-gel (PSG) method. The KBaYSi2 O7 :Bi 3+ phosphors exhibit an intense cyan emission or a unique narrow deep blue emission when excited by different wavelengths, which may bridge the cyan gap or act as a promising deep blue phosphor for white light-emitting diodes (WLEDs). The tunable multicolor emissions can be achieved by changing the Bi 3+ doping concentrations. The Bi 3+ /Eu 3+ co-doped KBaYSi2 O7 phosphors display intrinsic emissions of Bi 3+ and Eu 3+ and an energy transfer process between Bi 3+ and Eu 3+ can be detected. The luminescence colors of KBaYSi2 O7 :Bi 3+, Eu 3+ regularly shift from blue, through cold and warm white, finally toward orange-red by adjusting the relative doping concentrations of Bi 3+ and Eu 3+ . The single-phase white light-emitting material can be generated in both cold and warm white regions by simply varying the Eu 3+ doping concentrations. Furthermore, three kinds of WLEDs devices are fabricated by KBaYSi2 O7 :Bi 3+ or KBaYSi2 O7 :Bi 3+, Eu 3+ phosphors, which can exhibit dazzling white light emissions with eminent CIE coordinates, correlated color temperature, and color rendering index. The result offers direct evidence that the as-synthesized phosphors may be potentially applied in WLEDs and solid-state lighting.