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《CHINESE JOURNAL OF LUMINESCENCE》 1998-04
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STUDY ON THE ENERGY TRANSFER PROCESSES OF SQUARYLIUM CYANINE DYES

Zhao Wei Hou Yuanjun Zhang Baowen Cao Yi Zhang Zhilin Jiang Xueyin Xu Shaohong (Department of Materials Science, Shanghai University Jiading Campus, Shanghai 201800)  
The study on the interaction between squarylium cyanine dye (Sq) and porphyrin has confirmed that Sq can serve as an energy acceptor to emit red light. On basis of the principle, a red organic electroluminescent device using Sq doped 8 hydroxyquinolium aluminum (Alq) as the emission layer (EML) has been developed. Spectroscopic beha vior on the interaction of Sqs with Alq in the solid film were investigated to help understanding the luminescence mechanism. By linking the photoluminescence spectrum and electroluminescence spectrum together, a mechanism including the energy transfer process from excited Alq to Sq was suggested. Upon application of driving voltage, TPD supports injection and transportation of holes while Alq is capable of trapping electrons. The recombination of injected eletrons and holes on the emission layer (EML) creates the excited Alq molecules. The red electroluminescence on such device is ascribed to the luminescence from the singlet excited states of Sq, which are produced by energy transfer process from the excited Alq to Sq.
【Fund】: 国家自然科学基金委员会资助
【CateGory Index】: TN383.101
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