Sensitized carrier generation in evaporated thin films and particle dispersions of benzimidazole perylene

Zoran D. Popovic; Sang-Nam Lee; Christopher J. Collison; Ah-Mee Hor; Lewis J. Rothberg

doi:10.1117/12.363894

5 October 1999 Sensitized carrier generation in evaporated thin films and particle dispersions of benzimidazole perylene

Zoran D. Popovic, Sang-Nam Lee, Christopher J. Collison, Ah-Mee Hor, Lewis J. Rothberg

Author Affiliations +

Proceedings Volume 3799, Organic Photorefractives, Photoreceptors, Waveguides, and Fibers; (1999) https://doi.org/10.1117/12.363894
Event: SPIE's International Symposium on Optical Science, Engineering, and Instrumentation, 1999, Denver, CO, United States

Abstract

We studied photoconductivity in particle dispersions and vacuum evaporated films of benzimidazole perylene (BZP) pigment in contact with a tetraphenyldiamine (TPD) hole transport layer. Xerographic photoreceptors based on evaporated BZP photogenerator layers showed about two times higher carried generation efficiency than photoreceptors containing generator layer in the form of a particle dispersion. Time resolved fluorescence measurements were performed on these two types of structures. Fluorescence time evolution was compared in samples with and without TPD in a polycarbonate overcoat layer. Significantly larger decrease in average fluorescence lifetime was observed in structures containing thin evaporated films compared to the structures with the pigment in the form of particle dispersion. This indicates that reduced carrier generation efficiency in particle dispersion sin a consequence od exciton bulk trapping which significantly reduces the number of excitons reaching BZP/TPD interface. As carrier generation in BZP/TPD system is a result of exciton dissociation at the interface to produce electron-hole pairs. Thus a smaller number of excitons reaching the interface leads to reduction of carrier generation efficiency.

Citation Download Citation

Zoran D. Popovic, Sang-Nam Lee, Christopher J. Collison, Ah-Mee Hor, and Lewis J. Rothberg "Sensitized carrier generation in evaporated thin films and particle dispersions of benzimidazole perylene", Proc. SPIE 3799, Organic Photorefractives, Photoreceptors, Waveguides, and Fibers, (5 October 1999); https://doi.org/10.1117/12.363894

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available