Abstract
Efficient red, orange, green and blue monochrome phosphorescent organic light-emitting diodes (OLEDs) with simplified structure were fabricated based on ultrathin emissive layers. The maximum efficiencies of red, orange, green and blue OLEDs are 19.3cd/A (17.3lm/W), 45.7cd/A (43.2lm/W), 46.3cd/A (41.6lm/W) and 11.9cd/A (9.2lm/W). Moreover, efficient and color stable white OLEDs based on two complementary colors of orange/blue, three colors of red/orange/blue, and four colors of red/orange/green/blue were demonstrated. The two colors, three colors and four colors white OLEDs have maximum efficiencies of 30.9cd/A (27.7lm/W), 30.3cd/A (27.2lm/W) and 28.9cd/A (26.0lm/W), respectively. And we also discussed the emission mechanism of the designed monochrome and white devices.
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