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《Chinese Journal of Liquid Crystals and Displays》 2006-05
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Phosphoric Acid Treatment of ITO Substrate for Improvement of OLED Performance

ZHAI Lin,ZHONG Fei, LIU Peng-yi (Department of Physics, Jioan University, Guangzhou 510632, China)  
ITO-coated glass was immerged in phosphoric acid (H_3PO_4) with three kinds of concentration of 10 %, 15 %, 20 %(volume fraction),respectively. The observation with an atomic force micsoscopy (AFM) reveals that the surface roughness of the treated ITO film with the acid was remarkably improved. The record with a UV-visible light photometer indicates that the transparence of the ITO film keeps nearly unchanged after being treated with the phosphoric acid. The electrical and optical characteristics of OLEDs,which were fabricated on the treated ITO-coated glass with the classic structure of ITO/TPD/Alq/Al, were measured and compared with diodes prepared on the untreated sample. The results show that the diodes, which on the ITO treated with 15 % H_3PO_4, demonstrated the best photoelectric performance, in which the EL luminance and current efficiency has been promoted more nearly two times than that of the original devices, respectively.
【Fund】: 广东省自然科学基金资助项目(No.021169);; 暨南大学教改项目(No.51011533)
【CateGory Index】: TN312.8
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