کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1496244 992958 2011 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Preparation and photoluminescence properties of γ-KCaPO4: Eu2+ phosphors for near UV-based white LEDs
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
Preparation and photoluminescence properties of γ-KCaPO4: Eu2+ phosphors for near UV-based white LEDs
چکیده انگلیسی

Novel whitish-blue phosphors based on a phosphate host matrix, γ-KCaPO4: Eu2+, were prepared by a conventional solid-state reaction method using slightly phosphorus deficient conditions and their photoluminescence properties were investigated. The concentration quenching process, temperature dependence of the luminescence and decay curve were also investigated. The γ-KCaPO4: Eu2+ phosphor was efficiently excited by UV–Visible light at wavelengths of 200–450 nm and exhibited a bright whitish-blue emission with a maximum peak wavelength of 473 nm. All of these characteristics suggest that the γ-KCaPO4: Eu2+ phosphors combined with red phosphors could be applicable to near UV-based white LEDs, i.e., only two kinds of phosphor powders are needed for the formation of white light.


► The successful preparation of a new noble γ-KCaPO4: Eu2+ whitish-blue phosphor.
► Photoluminescent properties, concentration quenching effect, decay time and thermal luminescent properties were investigated.
► Broad excitation band in the NUV area.
► Intense broad whitish-blue emission band.
► Stokes shift and critical distance for energy transfer between the Eu2+ ions were calculated.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Optical Materials - Volume 33, Issue 7, May 2011, Pages 1036–1040
نویسندگان
, , , , , ,