A single-phased emission-tunable phosphor Ca9Y(PO 4)7:Eu2+,Mn2+ with efficient energy transfer for white-light-emitting diodes

Chien Hao Huang, Teng-Ming Chen*, Wei Ren Liu, Yi Chen Chiu, Yao Tsung Yeh, Shyue Ming Jang

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

279 Scopus citations


series of single-composition emission-tunable Ca9Y(PO 4)7:Eu2+,Mn2+ phosphors were synthesized by solid-state reaction. The energy transfer from Eu2+ to Mn2+ in Ca9Y(PO4)7 host matrix was studied and demonstrated to be a resonant type via a dipole-quadrupole mechanism with the critical distance of ∼ 11 A°. The wavelength-tunable white light can be realized by coupling the emission bands centered at 486 and 638 nm ascribed to the contribution from Eu2+ and Mn2+, respectively. By properly tuning the relative composition of Eu 2+/Mn2+, chromaticity coordinates of (0.31, 0.33) can be achieved under excitation at 250-440 nm. Moreover, white-light-emitting diodes were fabricated through the integration of 365 nm chips and single composition white-light- emitting phosphors (Ca0.975Eu001Mn 0.015)9Y(PO4)7 into a single package shows a cool white light of 7200 K, color rendering index of 76, and color coordinates of (0.30, 0.31) close to that of ideal white light can be achieved.

Original languageEnglish
Pages (from-to)259-264
Number of pages6
JournalACS Applied Materials and Interfaces
Issue number1
StatePublished - 27 Jan 2010


  • Cay(po)
  • Energy transfer
  • Eu
  • Mn
  • Photoluminescence
  • White-light led

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