高等学校化学学报 ›› 1999, Vol. 20 ›› Issue (S1): 107.

• Electroanalytical Chemistry • 上一篇    下一篇

Electrochemical Determination of the Energy Level of Organic Electroluminescent Materials

SONG Wen-Bo1, CHEN Xu1, JING Yan-Xia1, LIU Ying1, LU Nan1, XU Hong-Ding1, TIAN Wen-Jing2, WU Fang2, MA Yu-Guang2   

  1. 1. Department of Chemistry, Jilin University, Changchun 130023, P. R. China;
    2. Key Laboratory of Molecular Spectra and Structure, Jilin University, Changchun 130023, P. R. China
  • 出版日期:1999-12-31 发布日期:1999-12-31

Electrochemical Determination of the Energy Level of Organic Electroluminescent Materials

SONG Wen-Bo1, CHEN Xu1, JING Yan-Xia1, LIU Ying1, LU Nan1, XU Hong-Ding1, TIAN Wen-Jing2, WU Fang2, MA Yu-Guang2   

  1. 1. Department of Chemistry, Jilin University, Changchun 130023, P. R. China;
    2. Key Laboratory of Molecular Spectra and Structure, Jilin University, Changchun 130023, P. R. China
  • Online:1999-12-31 Published:1999-12-31

摘要:

The studies of energy level of organic/polymeric (organic) systems play a key role in organic light emitting devices (LED). Investigating of energy level not only involves determination of the band gap (Eg) of organic materials, but also involves determination of the absolute energy positions of the lowest unoccupied molecular orbital (LUMO) and the highest occupied molecular orbital (HOMO). The most widely used method for determination of the band gap values of organic materials is optical absorption spectroscopy,however, this method can not provide the absolute band edge positions of ELUM0 and EHOMO. Quantum chemical calculations (such as VEH) can also provide the values of Eg and EH0M0, but it is usually complicated and time-consuming. The photoemission analysis has also been investigated recently for determining the HOMO position of organic systems, however, the high price of the determination systems by this method leads to the limitation to use of it.

Abstract:

The studies of energy level of organic/polymeric (organic) systems play a key role in organic light emitting devices (LED). Investigating of energy level not only involves determination of the band gap (Eg) of organic materials, but also involves determination of the absolute energy positions of the lowest unoccupied molecular orbital (LUMO) and the highest occupied molecular orbital (HOMO). The most widely used method for determination of the band gap values of organic materials is optical absorption spectroscopy,however, this method can not provide the absolute band edge positions of ELUM0 and EHOMO. Quantum chemical calculations (such as VEH) can also provide the values of Eg and EH0M0, but it is usually complicated and time-consuming. The photoemission analysis has also been investigated recently for determining the HOMO position of organic systems, however, the high price of the determination systems by this method leads to the limitation to use of it.

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