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Proceedings Paper

Optically detected magnetic resonance (ODMR) studies of trions in organic light-emitting materials and OLEDs and their possible relation to long-term OLED degradation
Author(s): Ying Chen; Min Cai; Teng Xiao; Emily Hellerich; Joseph Shinar
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Paper Abstract

Some recent photoluminescence (PL)- and electroluminescence (EL)-detected magnetic resonance (PLDMR and ELDMR, respectively) studies of the negative (PL- and EL-quenching) spin 1/2 resonance are reviewed. These include the resonances in poly[2-(N-carbazolyl)-5-(2'-ethyl)-hexoxy-1,4-phenylenevinylene] (CzEh-PPV) films, rubrene films, tris(quinolinolate) Al (Alq3) OLEDs, rubrene-doped Alq3 OLEDs, and fac tris(2-phenylpyridine) iridium [Ir(ppy3)]-doped poly(N-vinyl carbazole) (PVK) polymer LEDs (PLEDs). The resonances are all assigned to quenching of SEs by trions, which are bipolarons stabilized by a counterpolaron or counterion. As bipolarons are spinless, their formation from two like-charged polarons is spin-dependent, and hence enhanced at resonance. This enhanced formation, and the resulting enhanced quenching of SEs, yields the negative spin 1/2 PLDMR and ELDMR. As previously shown, since trion formation also reduces the mobility of the trapped carriers, this process also results in a negative spin 1/2 electrical current-detected magnetic resonance (EDMR). Importantly, since the counterpolaron is usually trapped, e.g., at organic/cathode or organic/organic interfaces, or at impurity sites such the oxygen center in rubrene, it is suspected that the trions might be responsible for the long term degradation of OLEDs and PLEDs associated with abrupt junctions or impurities.

Paper Details

Date Published: 2 September 2008
PDF: 7 pages
Proc. SPIE 7051, Organic Light Emitting Materials and Devices XII, 70510G (2 September 2008); doi: 10.1117/12.796198
Show Author Affiliations
Ying Chen, Ames Lab., USDOE (United States)
Iowa State Univ. (United States)
Min Cai, Ames Lab., USDOE (United States)
Iowa State Univ. (United States)
Teng Xiao, Ames Lab., USDOE (United States)
Iowa State Univ. (United States)
Emily Hellerich, Ames Lab., USDOE (United States)
Iowa State Univ. (United States)
Joseph Shinar, Ames Lab., USDOE (United States)
Iowa State Univ. (United States)

Published in SPIE Proceedings Vol. 7051:
Organic Light Emitting Materials and Devices XII
Franky So; Chihaya Adachi, Editor(s)

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