Acta Photonica Sinica, Volume. 40, Issue 5, 658(2011)
Synthesis and Luminescence Properties of La2(WO4)3∶Eu3+ red Phosphors as LED Application
Eu3+-doped La2(WO4)3 phosphors were synthesized by a hydrothermal method with further heat treatment. X-ray diffraction (XRD), field-emission scanning electron microscopy (SEM), and energy dispersive spectrometer (EDS) were used to characterize the resulting samples of crystal phase structure, particle size and morphology and composition. Photoluminescence excitation and emission spectra and decay curve were used to characterize the fluorescence properties of phosphors. XRD analysis confirmed that the precursors and as-prepared sample (900 ℃ for 2 h) were α-La2W2O9 with triclinic structure and La2(WO4)3 with monoclinic structure, respectively. The results show that La2(WO4)3∶Eu phosphor exhibits intensive red emission under 395 nm excitation. The strongest line (395 nm) in excitation spectra of these phosphors matches with the output wavelength of UV InGaN-based light-emitting diodes (LEDs) chip. Hence, it is considered to be a new promising phosphor for generating white light devices.
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LIAO Jin-sheng, YOU Hang-ying, WEN He-rui, CHEN Jing-lin, YOU Wei-xiong, WEI Yin-wei. Synthesis and Luminescence Properties of La2(WO4)3∶Eu3+ red Phosphors as LED Application[J]. Acta Photonica Sinica, 2011, 40(5): 658
Received: Aug. 10, 2010
Accepted: --
Published Online: Jun. 14, 2011
The Author Email: Jin-sheng LIAO (jsliao1209@126.com)