Abstract
In this study, novel Na3Gd(PO4)2:Dy3+, Eu3+ phosphors were synthesized by a high-temperature solid-state method. Single-phase white lighting-emitting Na3Gd(PO4)2:Dy3+ phosphors exhibited blue and yellow emissions under 350 nm excitation, respectively. Eu3+-doped phosphors exhibited strong red emission at 621 nm under 394 nm excitation. Compared with that of Na3Gd(PO4)2:Dy3+, the color rendering index of Na3Gd(PO4)2:Dy3+, Eu3+ phosphor is improved from 74.7 to 78.9. Moreover, the correlated color temperature of Na3Gd(PO4)2:Dy3+, Eu3+ reduced significantly from 9872 K to 5460 K. The maximum energy transfer from Dy3+ to Eu3+ in Na3Gd(PO4)2:Dy3+, Eu3+ phosphor was ∼ 76.2% at Eu3+ concentration of 0.1. The chromaticity coordinate of the Dy3+ and Eu3+co-doped Na3Gd(PO4)2 phosphor was calculated as (0.3442, 0.3320), which is located in the white region. Furthermore, temperature-dependent photoluminescence emission properties indicate that the prepared phosphors exhibit good thermal stability. The study results indicate that the Na3Gd(PO4)2:Dy3+, Eu3+ phosphors exhibit immense potential for ultraviolet/near-ultraviolet light-excited white light emitting diodes applications.
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