Tuned emission from organic light emitting devices based upon divalent osmium complexes

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)22_Publication in policy or professional journal

3 Scopus Citations
View graph of relations

Author(s)

  • Brenden Carlson
  • Gregory David Phelan
  • Joo H. Kim
  • Alex K.Y. Jen
  • Larry Dalton

Detail(s)

Original languageEnglish
Pages (from-to)328-336
Journal / PublicationProceedings of SPIE - The International Society for Optical Engineering
Volume5214
Publication statusPublished - 2004
Externally publishedYes

Conference

TitleOrganic Light-Emitting Materials and Devices VII
PlaceUnited States
CitySan Diego, CA
Period4 - 6 August 2003

Abstract

Electrophosphorescence tuned from the green to red (522 nm - 650 nm) was achieved from double-layer light emitting devices using osmium (Os) complexes doped blend of either poly(vinylcarbazole) and 2-tert-butylphenyl-5-biphenyl-1, 3,4-oxadiazole (PVK:PBD), or poly(vinyl naphthalene) and 2-tert-butylphenyl-5- biphenyl-1,3,4-oxadiazole (PVN:PBD) as the emitting layer. Blending PVN with PBD greatly suppresses the electromer emission of PVN. The PVN:PBD blend emanates a short wavelength EL emission peaking at around 375 nm, which well overlaps with the absorption spectra of the Os complexes and ensures very efficient energy transfer to the Os complex dopants. PVK:PBD has an EL emission around 450 nm which does not overlap the absorption bands of the osmium complexes and also produces devices of lower efficiency, but PVK is a better transport layer and therefore produces brighter devices. The best external quantum efficiency of the double-layer devices was 2.2%, with a photometric efficiency of 1.9 cd/A. The brightest device achieved was 1,600 cd/m 2.

Citation Format(s)

Tuned emission from organic light emitting devices based upon divalent osmium complexes. / Carlson, Brenden; Phelan, Gregory David; Kim, Joo H.; Jen, Alex K.Y.; Dalton, Larry.

In: Proceedings of SPIE - The International Society for Optical Engineering, Vol. 5214, 2004, p. 328-336.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)22_Publication in policy or professional journal