کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1495055 992925 2012 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Sol–gel preparation and photoluminescence properties of LiLa(MoO4)2:Eu3+ phosphors
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
Sol–gel preparation and photoluminescence properties of LiLa(MoO4)2:Eu3+ phosphors
چکیده انگلیسی

LiLa(MoO4)2:Eu3+ (in brief LLM:Eu) phosphors have been prepared by sol–gel method. The properties of the resulting phosphors are characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), photoluminescence (PL) spectra and decay curve. The excitation spectra of LLM:Eu phosphors are mainly attributed to O2− → Mo6+ charge-transfer (CT) band at about 280 nm and some sharp lines of Eu3+ f–f transitions in near-UV and visible regions with two strong peaks at 395 and 465 nm, respectively. The emission spectra were used to probe the local environments of Eu3+ ion in LLM crystal. Under the 395 nm excitation, intense red emission peaked at 616 nm corresponding to 5D0 → 7F2 transition of Eu3+ are observed for 55 at.% LLM:Eu phosphors as the optimal doping concentration. The luminescence indicates that the local symmetry of Eu3+ ion in LLM crystal lattice has no inversion center. The luminescence properties suggest that LLM:Eu phosphor may be regarded as a potential red phosphor candidate for near-UV light emitting diodes (LEDs).


► The LiLa(MoO4)2:Eu phosphors can be synthesized by sol–gel process.
► The luminescence indicates that the local symmetry of Eu3+ ion in LLM crystal lattice occupies S4 site with no inversion center.
► LLM:Eu phosphors show the strong red emission at 616 nm under excitation of 395 nm.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Optical Materials - Volume 34, Issue 8, June 2012, Pages 1468–1472
نویسندگان
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