Integrated organic blue LED and visible-blind UV photodetector

Ali, Farman ; Periasamy, N. ; Patankar, Meghan P. ; Narasimhan, K. L. (2011) Integrated organic blue LED and visible-blind UV photodetector The Journal of Physical Chemistry C, 115 (5). pp. 2462-2469. ISSN 1932-7447

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Official URL: http://pubs.acs.org/doi/abs/10.1021/jp110381h

Related URL: http://dx.doi.org/10.1021/jp110381h

Abstract

In this paper, we report on an integrated OLED-photodetector organic device using 3,6-dipyrenyl-N-hexylcarbazole (P2NHC) as the active layer. This device is an efficient blue emitter in forward bias and an efficient visible-blind UV photodetector in reverse bias. In forward bias, the device (as a blue emitter) has a low turn on voltage (2.7 V), a current efficiency of 2.0 cd/A for a brightness of 200-9000 cd/m2, and low droop at higher brightness. In reverse bias, the device has a saturated photoresponse of 77 mA/W at 390 nm, which corresponds to an internal quantum efficiency of 64%. The spectral response of a photodetector-only device indicated that carriers are generated in the interface of P2NHC/cathode. The singlet exciton diffusion length of P2NHC was determined to be 7.8 ± 1 nm, which is too small to account for the high photodetector efficiency. Alternate mechanisms are discussed to account for the high photodetector efficiency.

Item Type:Article
Source:Copyright of this article belongs to American Chemical Society.
ID Code:81737
Deposited On:07 Feb 2012 11:10
Last Modified:07 Feb 2012 11:10

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