Photoluminescence-detected magnetic resonance (PLDMR) study of rubrene and oxygen-doped rubrene films and powders

Min Cai; Ying Chen; Joseph Shinar; Oleg Mitrofanov; Christian Kloc; Arthur P. Ramirez

doi:10.1117/12.827277

27 August 2009 Photoluminescence-detected magnetic resonance (PLDMR) study of rubrene and oxygen-doped rubrene films and powders

Min Cai, Ying Chen, Joseph Shinar, Oleg Mitrofanov, Christian Kloc, Arthur P. Ramirez

Author Affiliations +

Proceedings Volume 7415, Organic Light Emitting Materials and Devices XIII; 74151Y (2009) https://doi.org/10.1117/12.827277
Event: SPIE Photonic Devices + Applications, 2009, San Diego, California, United States

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.

Citation Download Citation

Min Cai, Ying Chen, Joseph Shinar, Oleg Mitrofanov, Christian Kloc, and Arthur P. Ramirez "Photoluminescence-detected magnetic resonance (PLDMR) study of rubrene and oxygen-doped rubrene films and powders", Proc. SPIE 7415, Organic Light Emitting Materials and Devices XIII, 74151Y (27 August 2009); https://doi.org/10.1117/12.827277

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