Study of sequential dexter energy transfer in high efficient phosphorescent white organic light-emitting diodes with single emissive layer

Jin Wook Kim, Seung Il You, Nam Ho Kim, Ju An Yoon, Kok Wai CHEAH, Fu Rong ZHU, Woo Young Kim*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

28 Citations (Scopus)

Abstract

In this study, we report our effort to realize high performance single emissive layer three color white phosphorescent organic light emitting diodes (PHOLEDs) through sequential Dexter energy transfer of blue, green and red dopants. The PHOLEDs had a structure of; ITO(1500Å)/NPB(700Å)/ mCP:Firpic-x%:Ir(ppy)3-0.5%:Ir(piq)3-y%(300Å)/TPBi(300Å)/Liq(20Å)/Al(1200Å). The dopant concentrations of FIrpic, Ir(ppy)3 and Ir(piq)3 were adjusted and optimized to facilitate the preferred energy transfer processes attaining both the best luminous efficiency and CIE color coordinates. The presence of a deep trapping center for charge carriers in the emissive layer was confirmed by the observed red shift in electroluminescent spectra. White PHOLEDs, with phosphorescent dopant concentrations of FIrpic-8.0%:Ir(ppy)3-0.5%:Ir(piq)3-0.5% in the mCP host of the single emissive layer, had a maximum luminescence of 37,810 cd/m2 at 11 V and a luminous efficiency of 48.10 cd/A at 5 V with CIE color coordinates of (0.35, 0.41).

Original languageEnglish
Article number7009
JournalScientific Reports
Volume4
DOIs
Publication statusPublished - 12 Nov 2014

Scopus Subject Areas

  • General

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