کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6598759 | 1423881 | 2018 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
An efficient blue phosphor Ba2Lu5B5O17:Ce3+ stabilized by La2O3: Photoluminescence properties and potential use in white LEDs
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
مهندسی شیمی (عمومی)
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چکیده انگلیسی
We demonstrate a blue emitting Ba2(Lu0.98La0.02)5B5O17:Ce3+ (BLLB:Ce3+) phosphor prepared by high-temperature solid-state reaction. The pure phase of Ba2Lu5B5O17 is difficult to obtain. To stabilize the crystal structure of Ba2Lu5B5O17, the larger ion radius of La3+ was added to substitute Lu3+ in raw materials. It is found that pure-phase Ba2Lu5B5O17 is successfully obtained by adding 2% La3+. Upon 348â¯nm excitation, a luminescence internal quantum efficiency of BLLB:Ce3+ can reach as high as 92%, which is comparable to the commercial blue phosphor BaMgAl10O17:Eu2+. The BLLB:Ce3+ phosphor shows a blue emission band peaked at 443â¯nm with a main excitation band peaked at 348â¯nm. The dependence of luminescence intensity on Ce3+ concentration was studied. The maximal luminescence intensity was observed at 1% Ce3+, which gives a critical distance of 2.41â¯nm between two Ce3+ ions for luminescence quenching. The emission of the present phosphor is stable with increasing temperature up to its quenching temperature of 403â¯K. A white light emitting diode (WLED) was fabricated based on a near UV LED chip coated with a blend of the present blue phosphor, the commercial green (Ba,Sr)2SiO4:Eu2+ and red CaAlSiN3:Eu2+ phosphors. The WLED exhibited a low correlated color temperature of 4356â¯K with a high color rendering index of 93.2. These results suggest that BLLB:1% Ce3+ can be utilized as a blue phosphor in UV based WLEDs.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Dyes and Pigments - Volume 154, July 2018, Pages 121-127
Journal: Dyes and Pigments - Volume 154, July 2018, Pages 121-127
نویسندگان
Yu Xiao, Zhendong Hao, Liangliang Zhang, Hao Wu, Guo-Hui Pan, Xia Zhang, Jiahua Zhang,