Efficient hybrid white organic light-emitting diodes for application of triplet harvesting with simple structure

• Published in: Journal of the Korean Physical Society Vol. 69; no. 3; pp. 328 - 334
• Main Authors: Hwang, Kyo Min, Lee, Song Eun, Lee, Sungkyu, Yoo, Han Kyu, Baek, Hyun Jung, Kim, Young Kwan, Kim, Jwajin, Yoon, Seung Soo
• Format: Journal Article
• Language: English
• Published: Seoul The Korean Physical Society 01.08.2016; Springer Nature B.V; 한국물리학회
• Subjects: Diamines; Mathematical and Computational Physics; Particle and Nuclear Physics; Physics; Physics and Astronomy; Quantum efficiency; Theoretical; 물리학; Triplet harvesting; Fluorescent and phosphorescent; Exciton generation zone; Hybrid white organic light-emitting diodes; Simple structure
• ISSN: 0374-4884; 1976-8524
• DOI: 10.3938/jkps.69.328

In this study, we fabricated hybrid white organic light-emitting diodes (WOLEDs) based on triplet harvesting with a simple structure. All the hole transporting material and host in the emitting layer (EML) of devices utilized the same material N,N′-di-1-naphthalenyl-N,N′-diphenyl [1,1′:4′,1″:4″,1‴-quaterphenyl]-4,4‴-diamine (4P-NPD), which is known to be blue fluorescent material. Simple hybrid WOLEDs were fabricated with blue fluorescent, green and red phosphorescent materials. We investigated the effect of triplet harvesting (TH) by an exciton generation zone on simple hybrid WOLEDs. The simple hybrid WOLEDs characteristically had a dominant hole mobility, so an exciton generation zone was expected in the EML. Additionally, the optimal the thickness of the hole transporting layer and electron transporting layer was fabricated a simple hybrid WOLEDs. The simple hybrid WOLED exhibits a maximum luminous efficiency of 29.3 cd/A and a maximum external quantum efficiency of 11.2%. The Commission Internationale de l′Éclairage (International Commission on Illumination) coordinates were (0.45, 0.43) at about 10,000 cd/m 2 .