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Spectroscopic Evaluation of a White Light Phosphor for UV-LEDs—Ca[sub 2]NaMg[sub 2]V[sub 3]O[sub 12]:Eu[sup 3+]

2005; Institute of Physics; Volume: 152; Issue: 12 Linguagem: Inglês

10.1149/1.2077328

1945-7111

Anant Setlur, Holly Comanzo, A.M. Srivastava, W.W. Beers,

Glass properties and applications

The luminescence of the vanadate garnet, , activated with trivalent europium is evaluated and discussed as a potential ultraviolet light-emitting diode (UV-LED) phosphor. This single phosphor is capable of converting the ultraviolet emission of a UV-LED into white light with good luminosity and color-rendering index. We have evaluated the luminescence of this material at elevated temperatures, because the junction temperatures of typical LEDs can be greater than . There is significant thermal quenching of this phosphor and emission color shift at . This is attributed to energy migration and transfer to nonradiative traps and within the host lattice. These implications on the use of this phosphor in UV-LED based light sources is also discussed.