کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1609135 1516258 2015 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Red emitting phosphors of Eu3+ doped Na2Ln2Ti3O10 (Ln = Gd, Y) for white light emitting diodes
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد فلزات و آلیاژها
پیش نمایش صفحه اول مقاله
Red emitting phosphors of Eu3+ doped Na2Ln2Ti3O10 (Ln = Gd, Y) for white light emitting diodes
چکیده انگلیسی


• Layered red phosphors Na2Ln2Ti3O10 (Ln = Gd, Y):Eu3+ were prepared.
• The synthesis parameters of phosphors were optimized.
• PL and thermal stability of the samples were investigated.
• LED devices were also fabricated including the present red phosphor.

A series of Eu3+ doped Na2Ln2Ti3O10 (Ln = Gd, Y) red-emitting phosphors for application in ultraviolet based light emitting diodes (LEDs) were successfully synthesized by a modified sol–gel method. Their structure and luminescent properties were characterized by powder X-ray diffraction (XRD), photoluminescence excitation (PLE) and emission (PL) spectra and absorption spectra, according to these results the optimal compositions and synthesis parameters were determined. In addition, the thermal stabilities of the phosphors were investigated according to the temperature-dependent PL spectra. The red and white-LEDs (W-LEDs) comprising the Na2Ln2Ti3O10:Eu3+ (Ln = Gd, Y) red emitting phosphors were fabricated with a near-ultraviolet (n-UV) chip. In comparison with Na2Y1.4Eu0.6Ti3O10, the Na2Gd0.6Eu1.4Ti3O10 phosphor offers higher brightness, quantum efficiency, and excellent thermal stability. W-LEDs comprising Na2Gd0.6Eu1.4Ti3O10 showed bright white emission with a color rendering index (Ra) of 82, a color temperature of 2151 K, and Commission Internationale de I’Eclairage (CIE) color coordinates of (0.34, 0.37). The phosphor Na2Gd0.6Eu1.4Ti3O10 is more suitable candidate for application in LEDs.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Alloys and Compounds - Volume 635, 25 June 2015, Pages 66–72
نویسندگان
, , , , ,