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Proceedings Paper

Photoluminescence-detected magnetic resonance (PLDMR) study of rubrene and oxygen-doped rubrene films and powders
Author(s): Min Cai; Ying Chen; Joseph Shinar; Oleg Mitrofanov; Christian Kloc; Arthur P. Ramirez
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Paper Abstract

A comprehensive photoluminescence (PL)-detected magnetic resonance (PLDMR) study of various vacuum-sealed rubrene films and powders is described. Three PLDMR features are observed and analyzed: (i) A negative (PL-quenching) triplet exciton (TE) resonance at T > 50K, due to reduced spin-dependent fusion of geminate TE pairs to singlet excitons (SEs). (ii) A positive (PL-enhancing) triplet resonance at T < 50K. This resonance is suspected to result from reduced quenching of SEs by a reduced population of polarons and nongeminate TEs, the latter due to the spin-dependent annihilation of TEs by polarons. (iii) A negative spin 1/2 (polaron) resonance, believed to be due to enhanced formation of trions at oxygen centers. As single crystal thin films of oxygen-doped rubrene exhibit exceptionally high room-temperature carrier mobility, the relation of this positive resonance to these transport properties is also discussed.

Paper Details

Date Published: 27 August 2009
PDF: 10 pages
Proc. SPIE 7415, Organic Light Emitting Materials and Devices XIII, 74151Y (27 August 2009); doi: 10.1117/12.827277
Show Author Affiliations
Min Cai, Ames Lab., U.S. Dept. of Energy (United States)
Iowa State Univ. (United States)
Ying Chen, Ames Lab., U.S. Dept. of Energy (United States)
Iowa State Univ. (United States)
Joseph Shinar, Ames Lab., U.S. Dept. of Energy (United States)
Iowa State Univ. (United States)
Oleg Mitrofanov, Univ. College London (United Kingdom)
Christian Kloc, Nanyang Technological Univ. (Singapore)
Arthur P. Ramirez, LGS Innovations Inc. (United States)


Published in SPIE Proceedings Vol. 7415:
Organic Light Emitting Materials and Devices XIII
Franky So; Chihaya Adachi, Editor(s)

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