Composition-induced valence variation of europium and the photoluminescence properties for Eu²⁺ doped borophosphate luminous glass in air

Abstract

A simultaneous blue-light and red-light emitting glass of SrO-B₂O₃-P₂O₅ doped with Eu₂O₃ is prepared in air, and then heat-treated without any reductive reagent. A transition combination is found to consist of a band emission peaked around 430 nm and a series of line emission from 593 nm to 611 nm, corresponding to the typical 4f⁶→5d 4f⁷ transition of Eu²⁺ and ⁵D₀→⁷F_J (J = 0, 1, 2, 3, 4) transitions of Eu³⁺, respectively. Some unidentified crystals such as Sr (PO₃)₂ and SrB₂O₄ as hosts for Eu2+ with more stronger crystal field lead to this enhancement of photoluminescence (PL) intensity superior to the asprepared parent glass.

Keywords

Glass Sample / Blue Emission / Glass Ceramic Sample / Parent Glass / Reduction Phenomenon

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