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.
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.