Synthesis and temperature-dependent optical properties of Eu³⁺-doped NaYSiO₄ red-emitting phosphors

Abstract

Novel Eu³⁺-activated orthosilicate NaYSiO₄:xEu³⁺ (x = 0.02, 0.05, and 0.20) red-emitting phosphors were developed for white light emitting diode applications. The X-ray diffraction (XRD), photoluminescence excitation and emission spectra, temperature-dependent curves were applied to characterize the samples. The red emission of the NaYSiO₄:Eu³⁺ phosphor corresponding to ⁵D₀→⁷F₂ (614 nm) transition was observed under the excitation of 394 nm wavelength, which is suitable for UV LED chip. The quenching temperature for NaYSiO₄:0.05Eu³⁺ was found to be over 500 K. The CIE chromaticity coordinates of NaYSiO₄:0.05Eu³⁺ are very close to the National Television System Committee (NTSC) standard red.

Keywords:

• Luminescence
• NaYSiO4:Eu3⁺
• orthosilicate
• phosphor

Acknowledgments

The authors thank Hunan provincial key laboratory of Xiangnan rare-precious metals compounds and applications and the construct program of the key discipline in Hunan province for financial support.