کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7223249 | 1470557 | 2018 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
A deep red-light-emitting phosphor Mn4+:CaAl4O7 for warm white LEDs
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موضوعات مرتبط
مهندسی و علوم پایه
سایر رشته های مهندسی
مهندسی (عمومی)
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Red-light-emitting phosphors Mn4+-doped CaAl4O7 were synthesized by high temperature solid-state reaction, and we investigated their photoluminescence properties for their applications in white-light-diodes (W-LEDs). Mn4+-doped CaAl4O7 exhibited deep red emission band peaking at 635, 641 and 655â¯nm arising from the spin-forbidden 2Eâ4A2 transition of Mn4+ under near ultraviolet (UV) or blue light excitation. The Commission International de L'Eclairage (CIE) chromaticity coordinates of 0.6at.% Mn4+-doped CaAl4O7 are (0.714, 0.285) under 470â¯nm excitation. The electric quadrupole-quadrupole interaction was the energy transfer mechanism in Mn4+-doped CaAl4O7 phosphor, and the critical distance of energy transfer between the Mn4+ ions was estimated to be about 1.533â¯nm. Mn4+-doped CaAl4O7 show poor thermal quenching properties based on the temperature-dependent fluorescent spectra. Further work to improve thermal stability need be carried out for Mn4+-doped CaAl4O7 as a promising red-light-emitting phosphor.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Optik - Volume 170, October 2018, Pages 178-184
Journal: Optik - Volume 170, October 2018, Pages 178-184
نویسندگان
S.X. Liu, F.B. Xiong, H.F. Lin, X.G. Meng, S.Y. Lian, W.Z. Zhu,