Abstract
Composite material titanium dioxide doped tris(8-hydroxyquinoline)-aluminium(TiO2-Alq3) was applied in organic lighting emitting diodes(OLED) as emitting material. Without encapsulation,it is found that TiO2-Alq3 as emitting layer in OLED exhibits significantly improved antiaging performance than that of the pure Alq3-based OLED. It can be attributed to the introduced of TiO2,which has good photochemical stability and the absorption ability in UV,etc. The OLED with optimized anti-aging performance was obtained after tuning the molar ration of reactants tetrabutyl titanate and aluminium sulfate to 1 ∶ 10. After aging 48 h in the air,the luminance and current efficiency of this optimized OLED still remained in the initial state of 89. 7% and 79. 6%,respectively. This work paves a new way to improve the anti-aging performance of OLED by modifying the emitting materials.
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