Combinatorial fabrication and studies of small molecular organic light-emitting devices

Gang Li, L. Zau, K. Q. Cheon, J. Shinar

Research output: Journal article publicationConference articleAcademic researchpeer-review

Abstract

Various combinatorial matrix arrays of UV-violet, white, and blue-to-red organic light-emitting devices (OLEDs), fabricated using a sliding shutter technique, are described. In the UV-violet devices, which contain a UV-violet emitting layer of 4,4′-bis(9-carbazolyl) biphenyl (CBP), the optimal radiance R and external quantum efficiency nextwere determined with respect to the thicknesses of the hole transporting layers. In the blue-to-red devices, which contained a blue-emitting layer of 4,4′-bis(2,2′- diphenyl-vinyl) -1,1′-biphenyl (DPVBi) and a red-emitting 5 wt.% dye-doped guest-host layer, the color of the devices evolved continuously from blue to red as the thickness of the doped layer increased from 0 to 35 Å. The (nominal) 2 Å-thick doped layer device exhibited the highest brightness L ∼ 120 Cd/m2and external quantum efficiency next∼4.4% at a current density of 1 mA/cm2. In the white OLEDs, which were similar to the blue-to-red devices but with lightly doped emission layer, the highest brightness Lmaxwas over 74,000 Cd/m2, in all devices Lmaxexceeded 50,000 Cd/m2. The maximum efficiencies were 11.0 Cd/A, 5.96 lm/W and 4.6% at 5.8 V, 0.6 mA/cm2, and 68 Cd/m2in a 0.25 wt.%, 2 nm-thick doped layer device.
Original languageEnglish
Pages (from-to)33-38
Number of pages6
JournalMaterials Research Society Symposium - Proceedings
Volume804
Publication statusPublished - 1 Dec 2003
Externally publishedYes
EventCombinatorial and Artificial Intelligence Methods in Materials Science II - Boston, MA., United States
Duration: 1 Dec 20034 Dec 2003

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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