Authors
Chang Liu, Cuiping He, Xue Zhang, Jie Liu, ZhanChao Wu, Xiaojun Wang
Published in
Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy. Volume 363. Issue Pt 2. Pages 128293. Jun 24, 2026. Epub Jun 24, 2026.
Abstract
A series of [Na+-Tb3+] co-doped apatite-type phosphors Sr4.90-2xNaxTbx(PO4)3Br: 0.10Eu2+ were synthesized via a high-temperature solid-state method, in which coupled [Na+-Tb3+] substitution was employed to maintain charge balance and regulate luminescence behavior. Their phase composition, morphology, XPS spectra as well as photoluminescence properties were studied. Under near-ultraviolet (NUV) excitation, the phosphors exhibit a broadband blue emission originating from Eu2+ (450 nm) together with characteristic green emissions of Tb3+ (490, 545, 585 and 622 nm), enabling continuous color tuning from blue to cold white by adjusting the Tb3+ concentration. The efficient Eu2+ → Tb3+ energy transfer process is verified, with a maximum efficiency of 54.20% at x = 0.50, and the transfer mechanism follows dipole-dipole interaction. Moreover, the obtained phosphors exhibit excellent thermal stability. Fabricated phosphor-converted LED devices also present acceptable luminescence performance with CRI of 61.05, CCT of 10,489 K and EQE of 15.4%. Compared with conventional fluoride-based or oxide-based apatite phosphors, the bromide-containing apatite host Sr5(PO4)3Br provides a suitable crystal field environment for stabilizing Eu2+ emission and facilitating effective Eu2+ → Tb3+ energy transfer. These results demonstrate that Sr4.90-2xNaxTbx(PO4)3Br: 0.10Eu2+ phosphors represent a viable blue to cold white color-tunable system with potential applicability in NUV excited phosphor-converted LEDs.
PMID:
42372366
Bibliographic data and abstract were imported from PubMed on 30 Jun 2026.
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