کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1261069 971780 2013 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Photoluminescent properties of tunable green-emitting oxynitride (Ba3−xSrx)Si6O12N2:Eu2+ phosphor and its application in white LEDs
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
Photoluminescent properties of tunable green-emitting oxynitride (Ba3−xSrx)Si6O12N2:Eu2+ phosphor and its application in white LEDs
چکیده انگلیسی

Green emitting Eu2+-doped (Ba3−xSrx)Si6O12N2 solid solutions were synthesized through solid state reaction at 1350 °C for 10 h under a N2/H2 atmosphere. The XRD patterns revealed that the solid solution series of (Ba3−x−ySrx)Si6O12N2:yEu2+ with x value ranging from 0–0.6 were established. An efficient and intense tunable green light was observed by varying the cation Sr/Ba ratio. The emission spectra exhibited an entire shift towards long wavelength with increasing of x value, which was caused by large crystal field splitting and Stokes shift. The x value dependence of emission intensity was discovered and explained by the enhanced probability of electron from excited 4f state to 5d ground state via nonradioactive transition. Highly thermal stability and feasible color coordinates were verified. White LEDs with excellent photochromic properties were fabricated by packing GaN based blue chips and (Ba,Sr)3Si6O12N2:Eu2+ phosphors. All results indicated that the (Ba3−xSrx)Si6O12N2:Eu2+ phosphors were confirmed to be a promising candidate for pc-white LEDs in solid state lighting.

Normalized PLE (λem=525–545 nm) (a) and PL (λex=460 nm) (b) spectra of (Ba2.7−x−ySrx)Si6O12N2:yEu2+ (x=0−0.6, y=0.3)Figure optionsDownload as PowerPoint slide

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Rare Earths - Volume 31, Issue 10, October 2013, Pages 944–949
نویسندگان
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