Eu3+ activated novel alkaline earth metal gallium oxide phosphors: Sr(2.92−x)Ca(x)Ga2O6:Eu3+0.08 for light emitting diodes

• Published in: Materials research bulletin 2012-09, Vol.47 (9), p.2676-2679
• Main Authors: Singh, S.K., Kim, Min Jae, Moon, Chuer Hyun, Lee, Dong Gi, Yi, Soung Soo, Jang, Kiwan, Jeong, Jung Hyun, Bae, Jong-Seong, Shin, Dong-Soo
• Format: Article
• Language: English
• Subjects: A. Optical materials; A. Oxides; C. X-ray diffraction; D. Optical properties
• ISSN: 0025-5408; 1873-4227
• DOI: 10.1016/j.materresbull.2012.05.021

[Display omitted] ► Synthesis and optical characterization of Eu3+ doped alkaline earth metal gallets. ► Effect of doping of Ca on crystal symmetry and fluorescence enhancement. ► Suitability of the gallet phosphors for light emitting diodes. Present study deals with Eu3+ activated novel alkaline earth metal (Sr and Ca) gallium oxide phosphors, Sr(2.92−x)Ca(x)Ga2O6:Eu3+0.08 (x=0 to 2.92). Crystal structure, morphology and luminescence (excitation, emission and CIE coordinate) properties of these phosphors have been studied as a function of Ca concentration. Doping of Ca ions into Sr2.92Ga2O6:Eu3+ phosphor gives rise to a significant enhancement in overall fluorescence and the optimum emission is attained for pure Ca2.92Ga2O6:Eu3+ phosphor for x=2.92. The intensity ratio of 5D0→7F2 to 5D0→7F1 transitions (monochromaticity) of Eu3+ for different doping concentration of Ca suggests that asymmetry around the Eu3+ ion increases with increase in Ca ion concentration, which is responsible for enhanced emission. The excellent optical features, such as broad excitation band (230–480nm) and excellent emission in red region (at 614nm), conclude that calcium gallet phosphor could be a potential candidate for light emitting diodes and display applications.