کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1529436 995754 2012 4 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
GeO2 dopant induced enhancement of red emission in CaAl12O19:Mn4+ phosphor
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد مواد الکترونیکی، نوری و مغناطیسی
پیش نمایش صفحه اول مقاله
GeO2 dopant induced enhancement of red emission in CaAl12O19:Mn4+ phosphor
چکیده انگلیسی

In order to search efficient red-emitting phosphors for white LEDs application, CaAl12O19:Mn4+ phosphors have been prepared by a combustion method assisted with GeO2 flux. The influence of GeO2 concentration and annealing temperature on the structure and luminescence intensity for the phosphors has been investigated. The mechanism for luminescence enhancement has been discussed. At GeO2 doping concentration of 1.5 mol%, the red emission intensity increases by 81% under 330 nm UVA excitation. More isolated luminescence center Mn4+ ions rather than pairs of Mn4+–Mn2+ ions are formed in the lattice with the introduction of GeO2 at high temperature oxidation, leading to the enhancement of the red emission. A feasible new way to enhance the red emission in CaAl12O19:Mn4+ phosphor is obtained.


► GeO2 dopant induced enhancement of red emission in CaAl12O19:Mn4+ phosphor.
► More isolated luminescence center Mn4+ ions form with the introduction of GeO2.
► The intensity of the red emission increases by 81% at x = 1.5 mol% by GeO2.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Science and Engineering: B - Volume 177, Issue 2, 15 February 2012, Pages 274–277
نویسندگان
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