Improved stability of organic electroluminescent devices by doping styrylamines in hole or electron transporting layer

Meng-Ting Lee; Chi-Hung Liao; Chih-Hung Tsai; Chin H. Chen
March 2005
Applied Physics Letters;3/7/2005, Vol. 86 Issue 10, p103501
Academic Journal
The stability of green organic electroluminescent devices has been improved by doping styrylamine derivate, p-bis(p-N,N-diphenyl-aminostyryl)benzene (DSA-Ph) in hole or electron transporting layer. Compared with the undoped device, the stability of the electron transporting layer has increased by a factor of 1.8 without affecting the electroluminescence efficiency of 11 cd/A and color (CIEx,y=0.34, 0.62). The enhanced stability is believed to derive from the hole trapping nature of DSA-Ph which can reduce the residual hole carriers in tris(8-hydroquinolinato)aluminum (Alq3) and suppress the formation of fluorescent quencher of Alq3 cationic species.


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