Single-phased emission-tunable Ca3Si2O7:Ce,Eu phosphors for white light-emitting diodes |
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| Authors: | Haidong Ju Lei Wang Baoling Wang Yinhai Ma Hai Wang Shibo Chen Xutang Tao |
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| Affiliation: | 1. Department of Chemistry, Kunming University, Kunming 650214, China;2. State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, China;3. Key Laboratory of Yunnan Provincial Higher Education Institutions for Organic Optoelectronic Materials and Devices, Kunming University, Kunming 650214, China |
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| Abstract: | A series of single-phased emission-tunable Ca3Si2O7:Ce3+, Eu2+ phosphors has been prepared by the solid-state reaction method. The phosphors show two intense emission bands at about 450 nm and 610 nm, which are attributed to the 5d→4f transitions of Ce3+ and Eu2+ ions, respectively. The emission colors of Ca3Si2O7:Ce3+, Eu2+ phosphors vary from blue (0.148, 0.147) to white (0.309, 0.260), and eventually to orange (0.407, 0.319) by tuning the Eu2+/Ce3+ ratio. Energy transfer from Ce3+ to Eu2+ is studied by luminescence spectra and energy transfer efficiency. The results show an electric quadrupole–quadrupole interaction plays an important role in the process of energy transfer. The phosphors with tunable emission are suitable for application in white light-emitting diodes. |
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| Keywords: | Phosphors Luminescence Energy transfer Emission-tunable |
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