| 光谱学与光谱分析 |
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| Investigation on Electroluminescence of MEH-PPV/ZnSe Nanocomposite Device |
| XIONG Sha,HUANG Shi-hua*,TANG Ai-wei,TENG Feng,LIANG Chun-jun,XU Zheng |
| Key Laboratory of Luminescence and Optical Information, Ministry of Education, Institute of Optoelectronic Technology, Beijing Jiaotong University, Beijing 100044, China |
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Abstract ZnSe nanocrystals were synthesized in aqueous solution by using mercapto-acetate acid as stabilizer. Products were characterized by X-ray diffraction patterns (XRD) and X-ray photoelectron spectra (XPS). A surfactant was used to transfer the nanocrystals from the aqueous solution to organic solvent, so that ZnSe and MEH-PPV could be mixed sufficiently and were used as an emitting layer in a multilayered electroluminescence device: Glass/ITO/MEH-PPV∶ZnSe /BCP/Alq3/LiF/Al. A comparison between absorption spectra and photoluminescence spectra of ZnSe nanocrystals and MEH-PPV thin film exhibits an effective energy transfer from ZnSe nanocrystals to MEH-PPV, which is one reason for the existing difference between photoluminescence spectrum and electroluminescence spectrum of MEH-PPV∶ZnSe nanocomposite film. The recombination mechanism of the nanocomposite film under photoexcitation and electric injection was discussed respectively. The authors investigated the photo- and electroluminescence properties of the device, and found that the EL intensity of ZnSe nanocrystals increased with the applied voltages. The I-V characteristic of this device is similar to that of a classic diode.
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Received: 2006-10-26
Accepted: 2007-01-29
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Corresponding Authors:
HUANG Shi-hua
E-mail: shhuang@center.njtu.edu.cn
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