A single-phased warm-white-emitting K3Y(PO4)2:Dy3+, Sm3+ phosphor with tuneable photoluminescence for near-UV-excited white LEDs. (October 2018)

• Record Type: Journal Article
• Authors: Devakumar, Balaji; Guo, Heng; Zeng, Yu-Jia; Huang, Xiaoyong
• Is Part Of: Dyes and pigments. Volume 157(2018)
• Page Start: 72
• Page End: 79
• Publication Date: 2018-10
• Subjects: Photoluminescence -- WLEDs -- Crystal structure -- Phosphors -- Rare earth ions -- White emissions; Dyes and dyeing -- Periodicals; Pigments -- Periodicals; 667.2
• DOI: 10.1016/j.dyepig.2018.04.042
• Languages: English
• ISSNs: 0143-7208

Abstract

Abstract: Single-phased warm-white-emitting Dy 3+ /Sm 3+ codoped K3 Y(PO4 )2 phosphors with tuneable emissions, tuneable color tone and correlated color temperature (CCT) were synthesized through conventional high temperature solid state method. The crystal structure, morphology, and photoluminescence properties of the phosphors were investigated in detail. Under 351 nm excitation, the K3 Y(PO4 )2 :0.03Dy 3+, 0.01 Sm 3+ sample emitted warm-white light with CIE coordinates of (0.433, 0.406), low CCT (3088 K) and excellent color rendering index of 95.31. The energy transfer mechanism from the Dy 3+ to Sm 3+ was determined to be electric dipole–dipole interaction. The results indicate that the Dy 3+ /Sm 3+ codoped K3 Y(PO4 )2 phosphors will find their suitable applications in the near-ultraviolet-pumped white light-emitting diodes. Graphical abstract: Highlights: Dy 3+ /Sm 3+ codoped K3 Y(PO4 )2 (KYP) color-tuneable phosphors were synthesized. The energy transfer from Dy 3+ to Sm 3+ was discussed in detail. These phosphors showed emission peaks in blue, yellow and orange-red regions. KYP:0.03Dy 3+, 0.01 Sm 3+ sample emitted warm white light under 351 nm excitation.