| 光谱学与光谱分析 |
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| Spectroscopic Properties of CeO2∶Eu3+ for White LEDs |
| FU Yue, CONG Yan*, YANG Yang, XIAO Yu, HE Yang-yang, WANG Li-mei, DONG Bin* |
| Liaoning Key Laboratory of Optoelectronic Films and Materials, School of Physics & Materials Engineering, Dalian Nationalities University, Dalian 116600, China |
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Abstract Under different Eu3+ concentration, Eu3+ doped CeO2 was prepared by co-precipitation method, and the structure and luminescent properties were studied through XRD, excitation and emission spectra. The PLE spectrum shows a broad charge-transfer band from 300～400 nm, and a week excitation line at 467 arise from 7F0—5D2 transition in Eu3+. The red emission arise from 5D0—7F1 (592 nm)and 5D0—7F2 transitions of Eu3+ has a great increase by high concentration doping under 467 nm excitation. The wavelength at 467 nm is nicely fitting in with the widely applied emission wavelengths of blue LED chips. It is indicated that the CeO2∶Eu3+ phosphor emits efficiently red emission under the blue light which makes it possible to create white light from a combination of a blue LED chip.
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Received: 2014-07-02
Accepted: 2014-10-28
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Corresponding Authors:
CONG Yan, DONG Bin
E-mail: congyan@dlnu.edu.cn
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