Photophysics of Pt-porphyrin electrophosphorescent devices emitting in the near infrared

被引：72
作者：
Sun, Yiru
Borek, Carsten
Hanson, Kenneth
Djurovich, Peter I.
Thompson, Mark E.
Brooks, Jason
Brown, Julie J.
Forrest, Stephen R. [1 ]
机构：
[1] Univ Michigan, Dept Elect Engn & Comp Sci, Ann Arbor, MI 48109 USA
[2] Univ Michigan, Dept Phys, Ann Arbor, MI 48109 USA
[3] Univ Michigan, Dept Mat Sci & Engn, Ann Arbor, MI 48109 USA
[4] Universal Display Corp, Ewing, NJ 08618 USA
[5] Univ So Calif, Dept Chem, Los Angeles, CA 90089 USA
[6] Princeton Univ, Dept Elect Engn, Princeton, NJ 08544 USA
来源：
APPLIED PHYSICS LETTERS | 2007年 / 90卷 / 21期
关键词：
D O I：
10.1063/1.2740113
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
The triplet annihilation dynamics of near infrared organic light-emitting devices are studied with peak electrophosphorescence at a wavelength of 772 nm using a platinum-porphyrin derivative Pt(II)-tetraphenyltetrabenzoporphyrin as dopant. Both the photoluminescent decay transients of the thin films and the quantum efficiency versus current density characteristics of devices using tris(8-hydroxyquinoline) aluminum or 4,4(')-bis(N-carbazolyl)biphenyl (CBP) as hosts are fitted by a model based on triplet-triplet annihilation. When the phosphor is codoped with Ir(III) bis(2-phenyl quinolyl-N,C-2') acetylacetonate in CBP, the quantum efficiency is enhanced, and the observed decrease of efficiency at high current densities is explained by field-induced charge pair dissociation. The external quantum efficiency has a maximum of (8.5 +/- 0.3)%, decreasing to (5.0 +/- 0.3)% at 1 mA/cm(2). (c) 2007 American Institute of Physics.
引用
收藏
页数：3
相关论文
共 18 条
[1]   Excitonic singlet-triplet ratio in a semiconducting organic thin film [J].
Baldo, MA ;
O'Brien, DF ;
Thompson, ME ;
Forrest, SR .
PHYSICAL REVIEW B, 1999, 60 (20) :14422-14428
[2]   Transient analysis of organic electrophosphorescence. II. Transient analysis of triplet-triplet annihilation [J].
Baldo, MA ;
Adachi, C ;
Forrest, SR .
PHYSICAL REVIEW B, 2000, 62 (16) :10967-10977
[3]   Highly efficient phosphorescent emission from organic electroluminescent devices [J].
Baldo, MA ;
O'Brien, DF ;
You, Y ;
Shoustikov, A ;
Sibley, S ;
Thompson, ME ;
Forrest, SR .
NATURE, 1998, 395 (6698) :151-154
[4]   Transient analysis of organic electrophosphorescence: I. Transient analysis of triplet energy transfer [J].
Baldo, MA ;
Forrest, SR .
PHYSICAL REVIEW B, 2000, 62 (16) :10958-10966
[5]   Highly efficient, near-infrared electrophosphorescence from a Pt-metalloporphyrin complex [J].
Borek, Carsten ;
Hanson, Kenneth ;
Djurovich, Peter I. ;
Thompson, Mark E. ;
Aznavour, Kristen ;
Bau, Robert ;
Sun, Yiru ;
Forrest, Stephen R. ;
Brooks, Jason ;
Michalski, Lech ;
Brown, Julie .
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION, 2007, 46 (07) :1109-1112
[6]   Room-temperature NIR phosphorescence of new iridium (III) complexes with ligands derived from benzoquinoxaline [J].
Chen, HY ;
Yang, CH ;
Chi, Y ;
Cheng, YM ;
Yeh, YS ;
Chou, PT ;
Hsieh, HY ;
Liu, CS ;
Peng, SM ;
Lee, GH .
CANADIAN JOURNAL OF CHEMISTRY, 2006, 84 (02) :309-318
[7]   Photoluminescence efficiency and absorption of aluminum-tris-quinolate (Alq(3)) thin films [J].
Garbuzov, DZ ;
Bulovic, V ;
Burrows, PE ;
Forrest, SR .
CHEMICAL PHYSICS LETTERS, 1996, 249 (5-6) :433-437
[8]   Charge-separation energy in films of π-conjugated organic molecules [J].
Hill, IG ;
Kahn, A ;
Soos, ZG ;
Pascal, RA .
CHEMICAL PHYSICS LETTERS, 2000, 327 (3-4) :181-188
[9]   Reduced geminate recombination in iridium-based electrophosphorescent materials [J].
Holmes, R. J. ;
Forrest, S. R. ;
Sajoto, T. ;
Tamayo, A. ;
Djurovich, P. I. ;
Thompson, M. E. .
ORGANIC ELECTRONICS, 2006, 7 (03) :163-172
[10]   Near-infrared photoluminescence and electroluminescence of neodymium(III), erbium(III), and ytterbium(III) complexes [J].
Kawamura, Y ;
Wada, Y ;
Yanagida, S .
JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS, 2001, 40 (01) :350-356
12