Luminescence characteristics of hybrid dual emitting layers in blue organic light-emitting diodes by controlling the fluorescent doping concentration

作者：Lee Bo Mi^*; Kim Nam Ho; Yoon Ju An; Lee Song Eun; Kim Young Kwan; Kim Woo Young; Mascher Peter

来源：Journal of Luminescence, 2014, 148: 72-78.

DOI：10.1016/j.jlumin.2013.11.065

• Hybrid blue OLEDs
• Dual emitting layers
• Fluorescent dopant
• Recombination zone

We demonstrate blue organic light emitting diodes (OLEDs) based on a host-dopant system with a dual emitting layer (EML) configuration consisting of variable concentration of fluorescent doped and fixed concentration of phosphorescent doped emitting materials. We also introduce two different device designs by switching the position of the fluorescent and phosphorescent EMLs. Because 4,4`-Bis(2,2-diphenylvinyl)-1,1'-biphenyl (BCzVBi), which is the blue fluorescent dopant, exhibits the highest occupied molecular orbital (HOMO) energy level compared to the neighboring layers, the fluorescent dopara is shown to strongly correlate with hole transport. in the fabricated blue OLEDs. In this study, we show how the electrical and optical properties of devices are affected by different doping concentrations due to the hole-transport-related properties of clopara molecules.

• 出版日期2014-4