Cooperative Emission in {ital {pi}}-Conjugated Polymer Thin Films

Journal Article · Wed Jan 01 04:00:00 EST 1997 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.78.729· OSTI ID:474650

Frolov, S; Gellermann, W; Ozaki, M; Vardeny, Z ^[1]; Ozaki, M; Yoshino, K ^[2]

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1. Department of Physics, University of Utah, Salt Lake City, Utah 84112 (United States)
2. Department of Electronic Engineering, Osaka University, Suita, Osaka 565 (Japan)

Picosecond dynamics of exciton emission and absorption have been studied in neat thin films of a variety of poly (phenylene vinylene) derivatives. We found that the stimulated emission band of 120nm width and {approximately}1ns duration, which is observed at low exciton density n, collapses at n{gt}10{sup 17}cm{sup -3} into a much narrower band of 7nm width and lifetime {tau}{lt}10ps. Based on its excitation intensity dependence, polarization, lifetime, illuminated area, and film thickness dependencies, we assign this narrow band to superfluorescence rather than to amplified spontaneous emission. {copyright} {ital 1997} {ital The American Physical Society}

• DOE Contract Number: FG03-93ER45490
• OSTI ID: 474650
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 4 Vol. 78; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
DECAY
EXCITONS
FLUORESCENCE
LIFETIME
POLARIZATION
POLYMERS
STIMULATED EMISSION
THIN FILMS