| Abstrakt: |
A perylene bisimide derivative of N,N'-diisopropylphenyl-1,6,7,12-tetrachloroperylene-3,4,9, 10-tetracarboxyl bisimide (PBI) is synthesized and used as a sensitizer for a photorefractive (PR) polymer composite. Small amount (0.1 wt%) of PBI sensitizer gives the maximum PR performance of composite based on poly(4-(diphenylamino)benzyl acrylate) (PDAA) (45 wt%), 2-(4-(azepan-1-yl)benzylidene)malononitrile (35 wt%), and (4-(diphenylamino)phenyl)methanol (24.9 wt%). mgn external diffraction efficiency of 49%, response time of 47 ms, and sensitivity of 28 cm² J-1 are obtained under an applied electric field of 40 µm-1 a writing beam of 532 nm. PBI sensitizer effectively forms a charge-transfer complex with PDAA, which favors the gen eration of the charge carriers followed by the space-charg formation. Furthermore, low PBI concentration contributes to low absorption coefficient at 532 nm, which leads to better PR performance. [ABSTRACT FROM AUTHOR] |
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