Color tuning of Eu-Tb co-doped borophosphate glasses for white light through valence state adjustment

Abstract

The dependence of color points of white light on the composition of borophosphate glasses co-doped with europium (Eu) and terbium (Tb) has been investigated in terms of valence change of rare earth ions. Under ultraviolet (UV) excitation, the white light is observed to be from a combination of 4f⁶5d → 4f⁷ band transition emission at 425 nm for Eu²⁺, ⁵D₀ → ⁷F_J (J=1, 2) line-emissions at 593 nm and 611 nm for Eu³⁺, and ⁵D₄ → ⁷F₅ band transition emission at 545 nm for Tb³⁺. By varying the glass composition, the resultant emission color can be tuned efficiently. Eventually, the optimized white light with commission international de I’Eclairage (CIE) coordinate of (0.3382, 0.2763) and the correlate color temperature (CCT) at 5010 K are achieved.

Keywords

Glass Composition / Blue Emission / Full Width Half Maximum / Correlate Color Temperature / Glass Host

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