Quantum Confinement Effects in Thin Films of Block Conjugated Copolymer Heterostructures
Abstract
A new ABA block conjugated copolymer, poly(2,5-benzoxazole)-block-poly(benzobisthiazole-2-hydroxy-1,4-phenylene)-block-poly(2,5-benzoxazole), has been synthesized, characterized, and used to investigate quantum confinement effects in semiconducting polymer heterostructures. Thin films of the self-organized block copolymer/homopolymer (ABA/A) blends are shown to exhibit quantum confinement effects at room temperature. New optical transition, enhanced luminescence, and enhanced stability of luminescence at high electric fields were observed to be characteristic of low dimensional excitons in the semiconducting polymer quantum-well heterostructures. Efficient excitation energy transfer from the higher energy gap block or homopolymer A to the lower energy gap block B in these self-organized block copolymer/homopolymer heterostructures was shown to lead to enhanced photobleaching, population inversion of B chromophores, and large stimulated emission from block B. Observation of efficient stimulated emission in these block copolymer/homopolymer blend thin films suggests the potential application of organic quantum-well heterostructures in solid state lasers.
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 16, 1998
- Accession Number
- ADA356885
Entities
People
- Samson A. Jenekhe
- X. L. Chen
Organizations
- University of Rochester