Visible-blind ultraviolet photo-detector using tris-(8-hydroxyquinoline) rare earth as acceptors and the effects of the bulk and interfacial exciplex emissions on the photo-responsivity

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • J. B. Wang
  • W. L. Li
  • B. Chu
  • L. L. Chen
  • G. Zhang
  • Z. S. Su
  • Y. R. Chen
  • D. F. Yang
  • J. Z. Zhu
  • S. H. Wua
  • F. Yan
  • H. H. Liu

Detail(s)

Original languageEnglish
Pages (from-to)1301-1306
Journal / PublicationOrganic Electronics: physics, materials, applications
Volume11
Issue number7
Publication statusPublished - Jul 2010

Abstract

A visible-blind ultraviolet (VB-UV) photo-detector (PD) was demonstrated by using tris-(8- hydroxyquinoline) gadolinium (Gdq) as the electron acceptor (A), 1,3,5-tris(3-methylphenyl- phenylamino) triphenyamine (m-MTDATA) as the donor (D). For the comparison the PD diodes were also fabricated using other rare earth (RE)-q (REq) complexes (RE = Y, La, Eu, or Lu) as the acceptors. It is found that Gdq-PD diode with 1:1 ratio of m-MTDATA:Gdq offers a maximum photo-responsivity of 230 mA/W at -7.5 V bias. This result is markedly higher than inorganic counterparts and previously organic PD diode (30 mA/W) reported by Ray and Narasimhan [Appl. Phys. Lett. 91 (2007) 093516]. Moreover, the spectral response does not cover visible region. So high responsivity of Gdq-PD was attributed to the presence of dominant dissociation of the geminate carrier pairs at D:A intermolecular contacts. The improvement is the results of the lowest exciplex- and bulk-emissions among the REq-PD diodes and in the various ratio of D:A blend, more detail mechanism was also discussed. Besides degradation tests of the Gdq-PD diode under UV and fluorescent lamp show that the UV detector can suffer from the application conditions. © 2010 Elsevier B.V. All rights reserved.

Research Area(s)

  • Exciplex, Organic photo-detector, Rare earth complexes, Ultraviolet, Visible-blind

Citation Format(s)

Visible-blind ultraviolet photo-detector using tris-(8-hydroxyquinoline) rare earth as acceptors and the effects of the bulk and interfacial exciplex emissions on the photo-responsivity. / Wang, J. B.; Li, W. L.; Chu, B.; Chen, L. L.; Zhang, G.; Su, Z. S.; Chen, Y. R.; Yang, D. F.; Zhu, J. Z.; Wua, S. H.; Yan, F.; Liu, H. H.; Lee, C. S.

In: Organic Electronics: physics, materials, applications, Vol. 11, No. 7, 07.2010, p. 1301-1306.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review