کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7224261 | 1470568 | 2018 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Sm3+ doped K3Gd3B4O12: An orange-emitting phosphor for white light-emitting diodes
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موضوعات مرتبط
مهندسی و علوم پایه
سایر رشته های مهندسی
مهندسی (عمومی)
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
K3Gd3-xSmxB4O12 orange phosphors were synthesized via the high temperature solid-state reaction method. The phase composition, morphology, particle size and luminescent properties were investigated using X-ray powder diffraction (XRD), scanning electron microscopy (SEM) and photoluminescence spectra (PL), respectively. The SEM images showed that the doped sample exhibited an irregular morphology with e diameter of about 2â¯Î¼m. The optimum doping concentration was found to be 15â¯mol% for Sm3+ ion and the critical distance Rc was calculated to be 7.8846â¯Ã
. Under near-UV light (405â¯nm) excitation, they showed intense orange emission centered at 603â¯nm because of the 4G5/2â¯ââ¯6H7/2 transition of Sm3+ activator. Under 276â¯nm excitation, there existed a charge transfer from Gd3+ to Sm3+ and the charge transfer efficiency of K3Gd3-xSmxB4O12 can reach 99.88%. The CIE coordinates of phosphor K3Gd2.85Sm0.15B4O12 are calculated to be (0.5895, 0.4096) and the color purity was estimated to be around 88%, which indicates that the phosphor may be potentially excited NUV chips for application in W-LEDs.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Optik - Volume 159, April 2018, Pages 115-122
Journal: Optik - Volume 159, April 2018, Pages 115-122
نویسندگان
Ji Zhao, Shan-Xiu Huang, Dan Zhao, Cun-Han Huang, Ming-Jie Ma, Rui-Juan Zhang, Yun-Chang Fan, Bao-Zhong Liu, Jia-Wang Gao, Qiu Zong, Ya-Ping Yu,