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High response organic ultraviolet photodetector based on a novel phosphorescent Cu (I) complex

BIN SU1,2, CHUNBO LIU3,2,* , GUANGBO CHE1,2, MIN LIU3, SHI ZHANG3, ZHANLIN XU3,2, QINGWEI WANG3,2

Affiliation

  1. College of Environment Engineering, Jilin Normal University, Siping, Jilin, 136000, People’s Republic of China
  2. Key Laboratory of Preparation and Applications of Environmental Friendly Materials, Jilin Normal University, Siping, Jilin,136000, People’s Republic of China
  3. College of Chemistry, Jilin Normal University, Siping, Jilin,136000, People’s Republic of China

Abstract

The authors demonstrate high response organic ultraviolet (UV) photodetector (PD) utilizing 4,4′,4′′-tris(3-methylphenylphenylamino)triphenylamine (m-MTDATA) and a novel phosphorescent Cu (I) complex [Cu(1,2-bis(diphenylphosphino)benzene)(4,7-diphenyl-1,10-phenanthroline)]BF4 (CuDB), to act as the electron donor and acceptor, respectively. CuDB behaves better electron transport ability compared with that of tris-(8-hydroxyquinolinato) aluminum (Alq3) and the PD is highly sensitive to UV light while it has almost no response to the visible light. The optimized PD offers a photocurrent up to 253 uA/cm2 at −10 V, corresponding to a response of 331 mA/W under an illumination of 365 nm UV light with power of 0.691 mW/cm2. We attribute the high response to the high electron transport ability of CuDB, the suppression of radiative decay of m-MTDATA and efficient charge transfer from m-MTDATA to CuDB. The working mechanism of the PD is also discussed in terms of the performance and device structures..

Keywords

Cu (I) complex, Organic ultraviolet photodetector, Radiative decay, Response.

Citation

BIN SU, CHUNBO LIU, GUANGBO CHE, MIN LIU, SHI ZHANG, ZHANLIN XU, QINGWEI WANG, High response organic ultraviolet photodetector based on a novel phosphorescent Cu (I) complex, Optoelectronics and Advanced Materials - Rapid Communications, 5, 9, September 2011, pp.999-1002 (2011).

Submitted at: July 25, 2011

Accepted at: Sept. 15, 2011