Tricolor emission Ca3Si2O7:Ln (Ln = Ce, Tb, Eu) phosphors for near-UV white light-emitting-diode

Tricolor emission in a same Ca3Si2O7 host with independent Ln (Ln = Ce3+, Eu2+, Tb3+) dopants is demonstrated to construct a near-UV white light emitting diode (LED). The luminescence properties and thermal quenching properties, as well as the applications in near-UV white LED are investigated. These phosphors show typical blue, red, and green, three-basal-color, luminescence in the CIE chromaticity diagram for Ce3+, Eu2+ and Tb3+ dopants, respectively. Thermal quenching properties show that the luminescence thermal stability strongly depends on the different dopant types; better thermal quenching property of Ce3+ and Tb3+ is recorded in comparison with that of Eu2+. The white LED prototype fabricated with near-UV chip and as-prepared tricolor phosphors exhibits acceptable CIE chromaticity coordinates (0.32, 0.30) with a CCT of 6000 K and a CRI of 87, indicating the potential application of Ca3Si2O7:Ln phosphors in near-UV white LED. (c) 2012 Elsevier B.V. All rights reserved.