Solution-processed colored electrodes for ITO-free blue phosphorescent organic light-emitting diodes

• Published in: Journal of Information Display Vol. 22; no. 1; pp. 21 - 30
• Main Authors: Huseynova, Gunel, Lim, Young-Ji, Gasonoo, Akpeko, Joo, Chul Woong, Yoo, Jae-Min, Lee, Seung-Hoon, Park, Jaeyoung, Cho, Nam Sung, Kim, Yong Hyun, Lee, Jonghee, Lee, Jae-Hyun
• Format: Journal Article
• Language: English
• Published: Seoul Taylor & Francis 02.01.2021; Taylor & Francis Ltd; Taylor & Francis Group; 한국정보디스플레이학회
• Subjects: Anodes; cationic dyes; Conducting polymers; conductive polymer electrodes; Doped films; Doping; Electrical resistivity; Electrodes; Light emitting diodes; Optoelectronics; organic dopants; Organic light emitting diodes; Phosphorescence; Polymer films; Polymers; solution-processed doping; Transport properties; 전기공학
• ISSN: 1598-0316; 2158-1606
• DOI: 10.1080/15980316.2020.1790434

Reported herein are solution-processed polymer anode electrodes for blue phosphorescent organic light-emitting diodes (PhOLEDs). The highly conductive anodes were made from 10-wt%-methyl-red-(MR)-doped poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) (PH1000) films. The red-colored and uniform polymer films demonstrated electrical conductivity values that significantly increased from 0.25 to 50 S·cm −1 after doping. The more than 200-fold enhancement in conductivity indicates that the doped films have a lower sheet resistance and better hole injection and transport properties than the pristine films. The resultant PhOLEDs based on the doped polymer anodes exhibited stable, broad, and intense blue emission at 468 nm with a 2616 cd·m −2 maximum luminance and a 4 V turn-on voltage. The obtained study results confirmed the effectiveness of the MR dye as a dopant for the significant enhancement of the conductivity and effective hole injection of PEDOT:PSS. Efficient future flexible optoelectronic applications can be built using this highly conductive polymer electrode obtained via a simple, solution-processed, and cost-effective doping approach.