Degradation of organic light-emitting diodes based on different-ligand complexes of terbium (III) salicylate and 2-phenoxybenzoate

Abstract : Degradation (D) of organic light-emitting diodes (OLEDs) based on new different-ligand complexes of terbium salicylate (Tb(Sal)3(TPPO)2) and 2-phenoxybenzoate (Tb(pobz)3(TPPO)2) with triphenyl phosphinoxide (TPPO) was studied. Initial reversible D is associated with charge carrier trap filling. A temperature increase, applied stress relief, and short-term irradiation with UV light lead to trapped charge carrier release and electroluminescence (EL) intensity recovery. During strong heating, irreversible D is observed after the recovery; this D requires in addition an electric field (EF). Intense UV light causes D without EF. The use of ac bias voltage eliminates reversible D, and sealing retards irreversible long-term D.
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https://hal.archives-ouvertes.fr/hal-02103527
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Submitted on : Thursday, April 18, 2019 - 2:42:39 PM
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L. Lepnev, A. Vashchenko, A. Vitukhnovskii, Eliseeva Svetlana, O. Kotova, et al.. Degradation of organic light-emitting diodes based on different-ligand complexes of terbium (III) salicylate and 2-phenoxybenzoate. Bulletin of the Lebedev Physics Institute, 2007, 34 (4), pp.102-106. ⟨10.3103/S1068335607040021⟩. ⟨hal-02103527⟩

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