Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 635, Issue -, Pages 66-72Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2015.02.014
Keywords
Optical materials; Optical properties
Categories
Funding
- high-level talent project of Northwest University, National Natural Science Foundation of China [11274251]
- Joint Funds of the National Natural Science Foundation of China and Guangdong Province [U1301242]
- Research Fund for the Doctoral Program of Higher Education of China (RFDP) [20136101110017, 20130171130001]
- Technology Foundation for Selected Overseas Chinese Scholar
- Ministry of Personnel of China (excellent)
- Natural Science Foundation of Shaanxi Province [2014JM1004]
- Foundation of Key Laboratory of Photoelectric Technology in Shaanxi Province [12JS094]
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A series of Eu3+ doped Na(2)Ln(2)Ti(3)O(10) (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 Na(2)Ln(2)Ti(3)O(10):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. (C) 2015 Elsevier B.V. All rights reserved.
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