Chroma Stability of WOLED with High-Voltage
Multilayer chroma stability of white OLEDs was realized with blue dye DPVBi and red dye DCJTB doped as luminescence layer. The blue dye doping concentration was kept at 6%, at the same time the red dye was reduced from 4%, 2%, 1% to 0.5%. The device color coordinates (CIE) were adjusted from (0.58, 0.42) to (0.31, 0.32), achieving the white light emission. A stable white emission for forward bias voltage changes from 6 to 17 V has been achieved. Its maximum luminance was 15030 cd/m2 at 17 V, and the maximum current efficiency was 4.65 cd/A at 9 V. We contributed the main reason of chroma stability to the complete energy transfer from CBP to DCJTB and the incomplete energy transfer between DPVBi and DCJTB by analyzing the spectrum and characteristic of the device so its performance was enhanced.
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Document Type: Short Communication
Publication date: March 1, 2018
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