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Bottom-emitting organic light-emitting diodes(BOLEDs),using Al/MoO_3 as the semitransparent anode and LiF/Al as tie reflective cathode and Alq_3 as the emitter,are fabricated.At the same time,the performance improvement of the BOLEDs having a capping layer inserted between the semitransparent anode and the glass substrate is studied.The optimized microcavity BOLED shows a current efficiency(5.49 cd/A) enhancement of 10%compared with a conventional BOLED based on ITO(5.0cd/A).Slight color variation is observed in120° forward viewing angle with 50 nm BCP as the capping layer.Strong dependence of efficiency on A1 anode thickness and the thickness and refractor index of the capping layer is explained.The results indicate that the BOLEDs with the double-aluminum electrode have potential practical applications.
Bottom-emitting organic light-emitting diodes (BOLEDs), using Al / MoO_3 as the semitransparent anode and LiF / Al as tie reflective cathode and Alq_3 as the emitter, are fabricated. At the same time, the performance improvement of the BOLEDs having a The capping layer inserted between the semitransparent anode and the glass substrate is studied. The optimized microcavity BOLED shows a current efficiency (5.49 cd / A) enhancement of 10% compared to a conventional BOLED based on ITO (5.0 cd / A) .Slight color variation is observed in 120 nm forward viewing angle with 50 nm BCP as the capping layer. Strong dependence of efficiency on A1 anode thickness and the thickness and refractor index of the capping layer is explained. The results indicate that the BOLEDs with the double-aluminum electrode have potential practical applications.