A negative polaron resistant p-type host for extended lifetime in deep blue phosphorescent organic light-emitting diodes. Issue 15 (19th March 2020)

• Record Type: Journal Article
• Authors: Yang, Chang Yoon; Chung, Won Jae; Jeong, Hyein; Lee, Yoonkyoo; Lee, Jun Yeob
• Is Part Of: Journal of materials chemistry. Volume 8:Issue 15(2020)
• Page Start: 5131
• Page End: 5136
• Publication Date: 2020-03-19
• Subjects: Materials -- Periodicals; Chemistry, Analytic -- Periodicals; Optical materials -- Research -- Periodicals; Electronics -- Materials -- Research -- Periodicals; 543.0284
• DOI: 10.1039/c9tc06702g
• Languages: English
• ISSNs: 2050-7526

Abstract

Abstract : A negative polaron resistant p-type host improved the device lifetime of blue phosphorescent organic light-emitting diodes. Abstract : A novel mixed host employing a negative polaron stabilizing p-type host was developed to extend the device lifetime of blue phosphorescent organic light-emitting diodes (PhOLEDs). Instead of a conventional p-type host with only a hole transport unit, a p-type host with a negative polaron resistant unit in addition to the hole transport unit was used in the mixed host consisting of a p-type host and an n-type host. The p-type host had benzonitrile as a negative polaron resistant unit which stabilized the molecule under negative polarons. The use of the p-type host with the benzonitrile unit almost doubled the device lifetime of the blue PhOLEDs due to the improved negative polaron stability of the hosts. Therefore, the p-type host with the weak electron accepting benzonitrile unit can play the role of a lifetime extending p-type host to replace a conventional p-type host.