Single-phased white-light phosphors Ca9Gd(PO4) 7:Eu2+, Mn2+ under near-ultraviolet excitation

Chien Hao Huang, Wei Ren Liu*, Teng-Ming Chen

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

193 Scopus citations


Single-phased white-light-emitting phosphors Ca9Gd(PO 4)7:Eu2+, Mn2+ were synthesized by solid state reactions. Tuning the Eu2+/Mn2+ ratio via the energy transfer varied the emission hue of Ca9Gd(PO4) 7:0.007Eu2+, Mn2+ from blue-greenish (0.219, 0.371) to white-light (0.326, 0.328) and eventually to red (0.625, 0.307). The mechanism of transferring energy from a sensitizer Eu2+ to an activator Mn2+ in Ca9Gd(PO4) 7:Eu2+, Mn2+ phosphors was demonstrated to be an electric dipole-quadrupole interaction. Combining a near-UV 380 nm chip and a white-emitting Ca9Gd(PO4)7:0.007Eu 2+, 0.02 Mn2+ phosphor produced a white-light near-UV LED, demonstrating CIE chromaticity coordinates of (0.312, 0.327) and a color temperature of 6569 K.

Original languageEnglish
Pages (from-to)18698-18701
Number of pages4
JournalJournal of Physical Chemistry C
Issue number43
StatePublished - 4 Nov 2010

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