TY - GEN
T1 - Role of photoconductivity in molecularly doped photorefractive polymer
AU - Goonesekera, Arosha W.
AU - Liphardt, Martin
AU - Ducharme, Stephen
AU - Takacs, James M.
AU - Zhang, Lei
PY - 1995
Y1 - 1995
N2 - The photorefractive effect is a reversible mechanism of holographic grating formation in electro-optic materials, that has potential applications in integrated optics, optical data storage, optical computing, and several other areas. This effect was recently observed in photorefractive polymers doped with charge transport agents. The grating formation is initialized by the photoconductive response which includes charge generation, mobility, and trapping, occurring in successive order. Finally, the grating is formed as a result of modulation of the refractive index by the resulting space charge field, via the electro-optic (Pockels) effect. We present the results of photoconductive measurements as a function of temperature, applied electric field, and illuminated intensity. The investigation is focused on the nonlinear optical polymer bisphenol A 4-4-nitroaminostilbene mixed with 30 weight % of the hole transport agent diethylamino-benzaldehyde diphenyl hydrazone. We observed that the photoconductivity of the photorefractive polymer has the form exp[ aE 1/2 + bE 1/2/T 2 - c/T 2] in agreement with the diorder theory of the well- known hopping model developed for charge-transport in molecularly doped polymers. We also observed that the apparent hopping distribution bandwidth increases with increased intensity, consistent with an increasing density of states.
AB - The photorefractive effect is a reversible mechanism of holographic grating formation in electro-optic materials, that has potential applications in integrated optics, optical data storage, optical computing, and several other areas. This effect was recently observed in photorefractive polymers doped with charge transport agents. The grating formation is initialized by the photoconductive response which includes charge generation, mobility, and trapping, occurring in successive order. Finally, the grating is formed as a result of modulation of the refractive index by the resulting space charge field, via the electro-optic (Pockels) effect. We present the results of photoconductive measurements as a function of temperature, applied electric field, and illuminated intensity. The investigation is focused on the nonlinear optical polymer bisphenol A 4-4-nitroaminostilbene mixed with 30 weight % of the hole transport agent diethylamino-benzaldehyde diphenyl hydrazone. We observed that the photoconductivity of the photorefractive polymer has the form exp[ aE 1/2 + bE 1/2/T 2 - c/T 2] in agreement with the diorder theory of the well- known hopping model developed for charge-transport in molecularly doped polymers. We also observed that the apparent hopping distribution bandwidth increases with increased intensity, consistent with an increasing density of states.
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M3 - Conference contribution
AN - SCOPUS:0029484289
SN - 0819418854
SN - 9780819418852
T3 - Proceedings of SPIE - The International Society for Optical Engineering
SP - 109
EP - 119
BT - Proceedings of SPIE - The International Society for Optical Engineering
A2 - Ducharme, Stephen
A2 - Borsenberger, Paul M.
T2 - Xerographic Photoreceptors and Photorefractive Polymers
Y2 - 10 July 1995 through 11 July 1995
ER -