title: Enriching red emission of Y3Al5O12: Ce3+ by codoping Pr3+ and Cr3+ for improving color rendering of white LEDs.
abstract: Triply doped Y3Al5O12: Ce3+, Pr3+, Cr3+ phosphors are prepared by solid state reaction. The emission spectra are enriched in the red region with the luminescence of both Pr3+ and Cr3+ through Ce3+ → Cr3+ and Ce3+ → Pr3+ → Cr3+ energy transfers. The properties of photoluminescence and fluorescence decay indicates larger macroscopic Ce3+ → Cr3+ transfer rates in the triply doped phosphors in comparison to Ce3+ and Cr3+ doubly doped one, reflecting the effect of competition between Ce3+ → Cr3+ and Ce3+ → Pr3+ transfers. White LEDs fabricated using the triply doped phosphor coated on blue LED chips show a color rendering index of 81.4 higher than that either using Ce3+ and Cr3+ doubly doped or Ce3+ singly doped phosphor.
authors.affiliation: Key Laboratory of Excited State Processes, CIOMP, Chinese Academy of Sciences, 3888 Eastern South Lake Road, Changchun 130033, China.
authors.forename: Lei
authors.initials: L
authors.lastname: Wang
authors.forename: Xia
authors.initials: X
authors.lastname: Zhang
authors.forename: Zhendong
authors.initials: Z
authors.lastname: Hao
authors.forename: Yongshi
authors.initials: Y
authors.lastname: Luo
authors.forename: Xiao-jun
authors.initials: XJ
authors.lastname: Wang
authors.forename: Jiahua
authors.initials: J
authors.lastname: Zhang