Optimization of hybrid blue organic light-emitting diodes based on singlet and triplet exciton diffusion length

The hybrid blue organic light-emitting diodes (HB OLEDs) with triplet harvesting (TH) structures within an emitting layer (EML) are fabricated with fluorescent and phosphorescent EMLs. The TH is to transfer triplet excitons from fluorescence to phosphorescence, where they can decay radiatively. Rema...

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Bibliographic Details
Published inJapanese Journal of Applied Physics Vol. 54; no. 6S1; pp. 6 - 10
Main Authors Lee, Song Eun, Lee, Ho Won, Lee, Jae Woo, Hwang, Kyo Min, Park, Soo Na, Yoon, Seung Soo, Kim, Young Kwan
Format Journal Article
LanguageEnglish
Published The Japan Society of Applied Physics 01.06.2015
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Summary:The hybrid blue organic light-emitting diodes (HB OLEDs) with triplet harvesting (TH) structures within an emitting layer (EML) are fabricated with fluorescent and phosphorescent EMLs. The TH is to transfer triplet excitons from fluorescence to phosphorescence, where they can decay radiatively. Remarkably, the half-decay lifetime of a hybrid blue device with fluorescent and phosphorescent EML thickness of 5 and 25 nm, measured at an initial luminance of 500 cd/m2, has improved twice than that of using a conventional structure. Additionally, the blue device s efficiency improved. We attribute this improvement to the efficient triplet excitons energy transfer and the optimized distribution of the EML which depends on singlet and triplet excitons diffusion length that occurs within each the EML.
ISSN:0021-4922
1347-4065
DOI:10.7567/JJAP.54.06FG09