Delayed Fluorescence and Triplet-Triplet Annihilation in {pi} -Conjugated Polymers

Journal Article · Sat May 01 00:00:00 EDT 1999 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.82.3673· OSTI ID:348209

Partee, J; Frankevich, E L; Uhlhorn, B; Shinar, J ^[1]; Partee, J; Uhlhorn, B; Shinar, J ^[2]; Frankevich, E L; Shinar, J ^[3]; Frankevich, E L ^[4]; Ding, Y; Barton, T J ^[5]

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1. Ames Laboratory---U.S. DOE, Iowa State University, Ames, Iowa 50011 (United States)
2. Physics and Astronomy Department, Iowa State University, Ames, Iowa 50011 (United States)
3. International Institute of Theoretical and Applied Physics, Iowa State University, Ames, Iowa 50011 (United States)
4. Institute of Energy Problems of Chemical Physics, Moscow 334 (Russia)
5. Ames Laboratory---U.S. DOE and Chemistry Department, Iowa State University, Ames, Iowa 50011 (United States)

The delayed fluorescence of poly(p -phenylene vinylene) (PPV) and poly(p -phenylene ethynylene) (PPE) derivative solids and frozen solutions at 20thinspthinspK is described. It provides strong evidence for triplet-triplet annihilation to singlets excitons, accounting for up to {approximately}{number_sign}{number_sign}3{percent} of the total emission in PPV films and {approximately}{number_sign}{number_sign}1.5{percent} in PPE powder. It also yields triplet lifetimes of 70 and 110 {mu}s in PPV films and frozen solutions, and {approximately}{number_sign}{number_sign}200 and {approximately}{number_sign}{number_sign}500 {mu} s in PPE powder and frozen solutions, respectively. {copyright} {ital 1999} {ital The American Physical Society}

• Research Organization: Ames National Laboratory
• DOE Contract Number: W-7405-ENG-82
• OSTI ID: 348209
• Journal Information: Physical Review Letters, Vol. 82, Issue 18; Other Information: PBD: May 1999
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
POLYMERS
FLUORESCENCE
POLYPHENYLS
EXCITONS
ANNIHILATION
THIN FILMS
POWDERS
SOLUTIONS