White and Saturated Blue Phosphorescent OLED based on the Non-Emissive Homoleptic Complex Ir(ppz)3 as single active material

Abstract

Abstract:The well-known homoleptic iridium (III) complex Ir(ppz) which is only emissive in solution at low temperature has been investigated as dopant in a p − i stacked OLED architecture. Interestingly, while using this phosphor as a single emitter, a white OLED was obtained. Emission colour was determined as being concentration and thickness-dependent.

Carbazole-based polymers as hosts for solution-processed organic light-emitting diodes: Simplicity, efficacy

“…These complexes also benefit from several appealing features including high quantum yield of luminescence [22,23], phosphorescence at room temperature [24] and relatively short excited state lifetimes so that key adverse factors such as triplet-triplet annihilation and back energy transfer from the guest to the host are strongly limited [25][26][27][28]. Emission color can also be easily tune by mean of the ligands introduced in the coordination sphere of the metal cation, enabling the emission to range from blue to red [29][30][31][32][33][34][35]. Beyond the simple control of the emission color, the emissive layer of an OLED comprising a triplet emitter cannot be only composed of a neat film of this latter (excepted for the emitters of specific design such as the dendrimers-like complexes) [36,37], but requires the metal complex to be diluted in a material named host to avoid self-quenching of the emitter [38].…”