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

L. Lepnev , A. Vashchenko , A. Vitukhnovskii , Svetlana V. Eliseeva (1) , O. Kotova , N. Kuzmina

1 MSU - Lomonosov Moscow State University

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.

Domaines: Chimie

L. Lepnev, A. Vashchenko, A. Vitukhnovskii, Svetlana V. Eliseeva, 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⟩