Stacked white OLED having separate red, green and blue sub-elements

Forrest, Stephen; Qi, Xiangfei; Slootsky, Michael

Stacked white OLED having separate red, green and blue sub-elements

Patent · 01 July 2014

OSTI ID:1136633

Forrest, Stephen; Qi, Xiangfei; Slootsky, Michael

The present invention relates to efficient organic light emitting devices (OLEDs). The devices employ three emissive sub-elements, typically emitting red, green and blue, to sufficiently cover the visible spectrum. Thus, the devices may be white-emitting OLEDs, or WOLEDs. Each sub-element comprises at least one organic layer which is an emissive layer--i.e., the layer is capable of emitting light when a voltage is applied across the stacked device. The sub-elements are vertically stacked and are separated by charge generating layers. The charge-generating layers are layers that inject charge carriers into the adjacent layer(s) but do not have a direct external connection.

Research Organization:: The University of Michigan, Ann Arbor, MI (USA)

Sponsoring Organization:: USDOE

DOE Contract Number:: FG02-07ER84809

Assignee:: The Regents of the University of Michigan (Ann Arbor, MI)

Patent Number(s):: 8,766,291

Application Number:: 13/124,698

OSTI ID:: 1136633

Country of Publication:: United States

Language:: English

References (8)

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Efficient, deep-blue organic electrophosphorescence by guest charge trapping Holmes, R. J.; D’Andrade, B. W.; Forrest, S. R. Applied Physics Letters, Vol. 83, Issue 18, p. 3818-3820 https://doi.org/10.1063/1.1624639	journal	November 2003
White organic LEDs and their recent advancements Misra, Aparna; Kumar, Pankaj; Kamalasanan, M. N. Semiconductor Science and Technology, Vol. 21, Issue 7 https://doi.org/10.1088/0268-1242/21/7/R01	journal	April 2006
White organic light-emitting devices with a phosphorescent multiple emissive layer Cheng, Gang; Zhang, Yingfang; Zhao, Yi Applied Physics Letters, Vol. 89, Issue 4 https://doi.org/10.1063/1.2227645	journal	July 2006
27.5L: Late-News Paper: Multiphoton Organic EL device having Charge Generation Layer Matsumoto, Toshio; Nakada, Takeshi; Endo, Jun SID Symposium Digest of Technical Papers, Vol. 34, Issue 1 https://doi.org/10.1889/1.1832449	journal	January 2003
High-efficiency tandem organic light-emitting diodes Liao, L. S.; Klubek, K. P.; Tang, C. W. Applied Physics Letters, Vol. 84, Issue 2 https://doi.org/10.1063/1.1638624	journal	January 2004
Very high-efficiency green organic light-emitting devices based on electrophosphorescence Baldo, M. A.; Lamansky, S.; Burrows, P. E. Applied Physics Letters, Vol. 75, Issue 1, p. 4-6 https://doi.org/10.1063/1.124258	journal	July 1999
Nearly 100% internal phosphorescence efficiency in an organic light-emitting device Adachi, Chihaya; Baldo, Marc A.; Thompson, Mark E. Journal of Applied Physics, Vol. 90, Issue 10 https://doi.org/10.1063/1.1409582	journal	November 2001

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