Laser-induced solution combustion of nano-Y2.96Al5O12:0.04Ce phosphors and their fluorescent properties for white light conversion

• Published in: Journal of alloys and compounds 2017-07, Vol.711, p.42-50
• Main Authors: Abd, Husnen R., Hassan, Z., Ahmed, Naser M., Omar, A.F., Alsultany, Forat H., Yusof, Y.
• Format: Article
• Language: English
• Subjects: Aluminum; Annealing; Carbon dioxide lasers; Cerium nitrate; Chemical composition; Chromaticity; Color temperature; Combustion synthesis; Continuous radiation; Crystallinity; Electroluminescence; Laser technique; Light emitting diodes; Luminescence; Microwave-oven method; Optical properties; Spectroscopic analysis; White LED; YAG: Ce+3
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2017.03.359

White light emission from blue light-emitting diodes (blue-LED) was generated using phosphor. Yttrium nitrate and aluminum nitrate phosphor doped with cerium nitrate (activator) and mixed with urea (fuel) were synthesized by a novel technique that uses continuous wave–CO2 laser-induced solution combustion synthesis (LISCS, 40 W). The annealing temperature to enhance crystallinity of particles at 1050 °C was achieved for 5 h. The crystallinity, structure, chemical composition, electroluminescence properties, and chromaticity of the powder phosphor samples with the composition Y(3−x) Al5O12:xCe3+ (x = 0.04) are reported in this study. All samples were investigated using Brunauer–Emmett–Teller method, X-ray diffraction, field emission-scanning electron microscopy, transmission electron microscopy, energy dispersive spectroscopy, Fourier transform infrared spectroscopy, electroluminescence and standard CIE 1931 chromaticity analysis. By controlling the composition and chemical structure of Y2.96Al5O12:0.04Ce3+ (YAG:Ce+3) mixed with epoxy, white light with a broadband luminescence spectrum, high color rendering index, and tunable correlated color temperature exhibits and offer cool white LED. Results reveal that the phosphor prepared using the novel technique (such as LISCS) produces excellent crystal phase and morphology, as well as better luminescence properties than the phosphor synthesized by using the traditional microwave technique. High white LED emission, with color coordinate values approaching ideal white light (0.333, 0.333) was investigated by using continuous wave–CO2 laser-induced solution combustion synthesis (LISCS, 40 W) annealed at 1050 °C during 5 h. [Display omitted] •YAG:Ce+3 phosphor powder was synthesized by a novel technique using CO2 laser.•The powder exhibited the optimum properties when annealed at 1050 °C during 5 h.•High crystallinity with small microstrain powder was investigated.•The powder exhibited excellent morphology with confirmed presence of Ce+3.•High white LED emission, offering cool white LED was obtained.