TY - JOUR
T1 - Synthesis, Crystal Structure and Photoluminescence Properties of Eu2+-Activated RbCaGd(PO4)2 Phosphors
AU - Chen, Xue
AU - Wang, Qidi
AU - Lv, Fengzhu
AU - Chu, Paul K.
AU - Zhang, Yihe
PY - 2016
Y1 - 2016
N2 - A series of novel double-phosphate compounds RbCaGd(PO4)2:Eu2+ were first synthesized by the Pechini-type sol–gel method, and their structure and luminescence properties were characterized in detail. The compound RbCa0.97Gd(PO4)2:0.03Eu2+ crystallizes in the hexagonal system with space group P6222 and the parameters a = 7.006(49) Å, c = 6.358(80) Å, and V = 269.969 Å3, Z = 1. Its crystal structure is similar to that of hexagonal LnPO4, where the Rb atom occupies a large tunnel in the lattice and the Ln position is statistically occupied by both Gd and Ca (Eu) atoms. In addition, RbCaGd(PO4)2:Eu2+ produces an intense broadband emission from 400 to 600 nm with the CIE coordinates near (0.2089, 0.2674) and assembles a broad excitation spectrum from 250 to 425 nm. The concentration quenching, crystal field splitting, critical energy transfers distance and thermally stable luminescence properties of RbCaGd(PO4)2:Eu2+ phosphors are all discussed, which indicate that this material can be considered as a promising bluish green phosphor for application in white-light UV LEDs.
AB - A series of novel double-phosphate compounds RbCaGd(PO4)2:Eu2+ were first synthesized by the Pechini-type sol–gel method, and their structure and luminescence properties were characterized in detail. The compound RbCa0.97Gd(PO4)2:0.03Eu2+ crystallizes in the hexagonal system with space group P6222 and the parameters a = 7.006(49) Å, c = 6.358(80) Å, and V = 269.969 Å3, Z = 1. Its crystal structure is similar to that of hexagonal LnPO4, where the Rb atom occupies a large tunnel in the lattice and the Ln position is statistically occupied by both Gd and Ca (Eu) atoms. In addition, RbCaGd(PO4)2:Eu2+ produces an intense broadband emission from 400 to 600 nm with the CIE coordinates near (0.2089, 0.2674) and assembles a broad excitation spectrum from 250 to 425 nm. The concentration quenching, crystal field splitting, critical energy transfers distance and thermally stable luminescence properties of RbCaGd(PO4)2:Eu2+ phosphors are all discussed, which indicate that this material can be considered as a promising bluish green phosphor for application in white-light UV LEDs.
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U2 - 10.1039/c5ra25124a
DO - 10.1039/c5ra25124a
M3 - RGC 21 - Publication in refereed journal
SN - 2046-2069
VL - 6
SP - 11211
EP - 11217
JO - RSC Advances
JF - RSC Advances
IS - 14
ER -