Using interlayer step-wise triplet transfer to achieve an efficient white organic light-emitting diode with high color-stability

Qi Wang, Dongge Ma, Karl Leo, Junqiao Ding, Lixiang Wang, Qiquan Qiao, Huiping Jia, Bruce E. Gnade

Research output: Contribution to journalArticlepeer-review

12 Scopus citations

Abstract

An efficient phosphorescent white organic light emitting-diode with a red-green-blue tri-emitting-layer structure is reported. The host of the red dopant possesses a lower triplet-energy than the green dye. An interlayer step-wise triplet transfer via blue dye → green dye → red host → red dye is achieved. This mechanism allows an efficient triplet harvesting by the three dopants, thus maintaining a balanced white light and reducing energy loss. Moreover, the color stability of the device is improved significantly. The white device not only achieves a peak external quantum efficiency of 21.1 ± 0.8% and power efficiency of 37.5 ± 1.4 lm/W but shows no color shift over a wide range of voltages.

Original languageEnglish (US)
Article number193303
JournalApplied Physics Letters
Volume104
Issue number19
DOIs
StatePublished - May 12 2014
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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