کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7996610 | 1516207 | 2016 | 28 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Preparation, photoluminescence and thermally stable luminescence of high brightness red LiY5P2O13:Eu3+ phosphor for white LEDs
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
فلزات و آلیاژها
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
A new red-emitting phosphor LiY5(1âx)P2O13:xEu3+ has been prepared using a conventional high-temperature solid-state method. The phosphors were characterized by X-ray powder diffraction (XRD). The characteristic photoluminescence properties were studied in detail by ultraviolet-visible diffuse reflection, photoluminescence excitation (PLE), emission (PL) spectra and decay times. The concentration quenching mechanism has been investigated, and demonstrated to involve a dipole-quadrupole interaction. Under excitation at 394 and 467 nm, sharp red light can be observed due to the 5D0 â 7F2 transition of the Eu3+ ions. The intensity of the emission from 5D0 to 7F2 is 3.9 times higher than that of commercial phosphors, Y2O2S:Eu3+ when the Eu3+ concentration is x = 0.1. Judd-Ofelt parameters of Eu3+ in the LiY5P2O13 phosphors were calculated, and the refractive index of LiY5P2O13 was deduced to be about 2.22. Finally, LiY5P2O13:Eu3+ exhibited excellent thermal stability compared with Y2O2S:Eu3+. The above results suggest that LiY5P2O13:Eu3+ can be a potential red emitting phosphor for NUV/blue pumped white LEDs.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Alloys and Compounds - Volume 686, 25 November 2016, Pages 601-607
Journal: Journal of Alloys and Compounds - Volume 686, 25 November 2016, Pages 601-607
نویسندگان
Jianwei Qiao, Lei Wang, Yongfu Liu, Ping Huang, Qiufeng Shi, Yue Tian, Cai'e Cui,