Browsing by Author "Chuang, Shao-Tang"

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Extended spectral response in organic photomultiple photodetectors using multiple near-infrared dopants
(2012-01-02)
Chuang, Shao-Tang
;
Chien, Shang-Chieh
;
Chen, Fang-Chung
;
光電工程學系
;
顯示科技研究所
We demonstrate highly sensitive polymer photodetectors (OPDs) with spectral response extending from the ultraviolet to the near-infrared (NIR) region (similar to 1200 nm). After doping two NIR dopants, high external quantum efficiencies (similar to 5500%) and high responsivities (23.0 A/W) are achieved under a low reverse bias (-3.7 V). The high gains could be attributed to unbalanced carrier transport in the photoactive layer arising from the electron traps at the NIR dopants. This approach allows the ready preparation of OPDs exhibiting broad spectral responses and high quantum efficiencies simultaneously. (C) 2012 American Institute of Physics. [doi:10.1063/1.3675573]
Suppression of phase separation through blending of electron transporting materials in polymer electrophosphorescent devices
(2011-04-01)
Chen, Fang-Chung
;
Chen, Yung-Shivan
;
Chien, Shang-Chieh
;
Liao, Cheng-Hsiang
;
Chuang, Shao-Tang
Herein, we report the concentration effect of an electron transporting material, 1,3-bis ((4-tert-butyl-phenyl)-1,3,4-oxidiazolyl) phenylene (OXD-7), on the performance of polymer electrophosphorescent devices. From the phase mode images of atomic force microscopy, we observed that phase separation between the host material and the triplet dopants was suppressed in the photoactive film while the concentration of OXD-7 was increased. Correspondingly, the single-layer blue light-emitting device with the best external quantum efficiency of 7.9% was achieved. We attributed the device enhancement to the improved compatibility between the host and the phosphorescent molecules after the addition of OXD-7 molecules. (C) 2010 Elsevier B.V. All rights reserved.