| 光谱学与光谱分析 |
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| Spectral Analysis of LED Excited Organic Material MPPV |
| BI Chang-dong, ZHANG Fang-hui |
| College of Electric and Communication, Shaanxi University of Science and Technology, Xi’an 710021, China |
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Abstract By the method of spin-coating，a glass was coated with a layer of organic material MPPV dissolved in organic solvent tetrahydrofuran (THF). The radios of MPPV : THF were 25 mg∶1 mL,50 mg∶1 mL, 100 mg∶1 mL and 150 mg∶1 mL. Then we irradiated the organic thin film by blue and white LED. The results showed that the blue and white LEDs could excite the organic material MPPV to emit red light in the region of 600~750 nm. And with the increase in the organic material MPPV, the color coordinate moved from (0.265 4, 0.248 9) to (0.395 4, 0.288 0) gradually. When the ratio of MPPV∶THF was 100 mg∶1 mL, the white LED had the best color-rendering index of 86.1. The minimum of color temperature reached 2609K which was lower than that of white LED obtained by blue LED excited yellow YAG phosphor. Therefore, with the method of blue and white LED exciting the organic material MPPV, the color-rendering index and luminescence properties of LED could be improved significantly.
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Received: 2011-07-04
Accepted: 2011-09-28
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Corresponding Authors:
BI Chang-dong
E-mail: bichangdong@163.com
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