Papers by Keyword: Sr2SiO4

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Authors: Huang Yu Chen, Shoou Jinn Chang, Min Hang Weng, Ru Yuan Yang
Abstract: A Eu3+ activated strontium silicate phosphor was synthesized by solid-state reaction and Li+ ion was added to balance the charge valence. X-ray powder diffraction analysis confirmed the formation of pure Sr2SiO4 phase without second phase or phases of starting materials irrespective of the adding amount of Li+. Scanning electron microscopy showed large particle size and necking shape were obtained as the concentrations of Li+ ions increase. In the PL studies, the excitation spectrum of Sr2SiO4:Eu3+,Li+ phosphors exhibited a broad band in the UV region centered at about 270 nm attributed to charge transfer state (CTS) band. As the Li+ ion concentration increased, the photoluminescence intensity of the red emission at 617 nm of Eu3+ ions was enhanced. The results showed that Li+ ion is a effective charge compensators used in Sr2SiO4:Eu3+ phosphor.
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Authors: J.K. Park, Chang Hoi Kim, Kyung Joo Choi, H.D. Park, Se Young Choi
Abstract: We have synthesized a Eu2+-activated Sr2SiO4yellow phosphor and investigated an attempt to develop white LEDs by combining it with a GaN blue LED chip. Two distinct emission bands from the GaN-based LED and the Sr2SiO4:Eu phosphor are clearly observed at 400 nm and at around 550 nm, respectively. These two emission bands combine to give a spectrum that appears white to the naked eye. Our results show that GaN (400 nm chip)-based Sr2SiO4:Eu exhibits a better luminous efficiency than that of the industrially available product InGaN (460 nm chip)-based YAG:Ce.
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