No abstract

No abstract

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%). High 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 V μm−1 at writing beam of 532 nm. PBI sensitizer effectively forms a charge‐transfer complex with PDAA, which favors the generation of the charge carriers followed by the space‐charge formation. Furthermore, low PBI concentration contributes to low absorption coefficient at 532 nm, which leads to better PR performance.

Front Cover: A perylene bisimide derivative (PBI) as a role of sensitizer forms the charge transfer (CT) complex with the polymer matrix of poly(4‐(diphenylamino)benzyl acrylate) (PDAA) in a photorefractive composite system. This formation favorizes the generation of the charge carriers followed by an effective enhancement in the photo‐refractive performances. Interestingly, with only small amount (0.1 wt%) of PBI, an external diffraction efficiency of 49% with response time of 47 ms, and sensitivity of 28 cm2 J−1 can be obtained under an applied electric field of 40 V μm−1 at writing beam of 532 nm. Further details can be found in the article by Tam Van Nguyen, Ha Ngoc Giang, Kenji Kinashi, Wataru Sakai, and Naoto Tsutsumi* on page 85.

No abstract