Ca9La(P04)7i:Eu2+,Mn2+: An emission-tunable phosphor through efficient energy transfer for white light-emitting diodes

Chien Hao Huang*, Teng-Ming Chen

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

216 Scopus citations

Abstract

We have synthesized a series of single-composition emissiontunable Ca 9La(PO4)7:Eu2+,Mn2+ (CLP:Eu 2+,Mn2+) phosphors by solid state reactions. Through an effective resonance-type energy transfer, the CLP:Eu2+,Mn 2+ phosphors exhibit a systematically varied hues from green, yellow, and eventually to red and the relative intensity of green and red emissions can be tuned by adjusting the concentration OfMn2+, respectively. The energy transfer from Eu2+ to Mn2+ in CLP:Eu2+,.Mn 2+ has been studied and demonstrated to be a resonant type via a dipole-quadrupole mechanism based on the decay lifetime data and the energy transfer critical distance was estimated to be 11.36 Å by using the spectral overlap methods. A warm white light emitting diode (WLED) with CIE chromaticity coordinates of (0.35, 0.31), superior color-rendering index (Ra) of 91.5 and lower correlated color temperature (CCT) of 4,496 K was fabricated by combining a 365 nm UV-InGaN chip and a phosphor blend of yellow-emitting (Ca0.98Eu0.005Mn0.015)9La(PO 4)7 and blue-emitting BaMgAl10O 17:Eu2+.

Original languageEnglish
Pages (from-to)5089-5099
Number of pages11
JournalOptics Express
Volume18
Issue number5
DOIs
StatePublished - 1 Mar 2010

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