Abstract
In this report, we demonstrate the effect of the polar non-linear chromophore and other polar additives on hole mobilities in photorefractive polymer systems. The hole mobility measurements are presented as a function of applied field and temperature in two model systems. The nonlinear optical chromophore 4′ nitro-4′-aminostilbene (NAS), having a large dipole moment of 6.7 Debye, is doped or covalently attached into a polymer matrix containing 30% by weight of diethylamino-benzaldehyde diphenyl hydrazone (DEH), a hole transport agent. The results are described by the Gaussian disorder model based on hopping through a manifold of states with superimposed energetic and positional disorder. We conclude from the results that the main effect produced by the polar additives is the reduced mobility, in agreement with the dipolar disorder model. The dipolar chromophores required in photorefractive polymers significantly decrease carrier mobility and also the speed of response.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 195-206 |
| Number of pages | 12 |
| Journal | Proceedings of SPIE - The International Society for Optical Engineering |
| Volume | 3144 |
| DOIs | |
| State | Published - 1997 |
| Event | Xerographic Photoreceptors and Organic Photorefractive Materials II - San Diego, CA, United States Duration: Jul 28 1997 → Jul 28 1997 |
Keywords
- Disorder
- Hopping
- Mobility
- Nonlinear optical
- Photorefractive
- Polar additives
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Computer Science Applications
- Applied Mathematics
- Electrical and Electronic Engineering