High-efficiency and deep-blue fluorescent organic light-emitting diodes with the easily controlled doping concentrations

This paper reports series of highly efficient organic light-emitting diodes (OLEDs) with high-quality blue emission that employs an aromatic enyne derivative (E)-CPEY doped in the CBP (4, 4′-N, N′-dicarbazolylbiphenyl) host with the easily controlled doping concentrations as the emitters. The peak EL efficiencies (>8.5 cd A−1, >5.5 lm W−1 and ⩾6.0%) of these blue OLEDs with the stable CIE (0.15, 0.10 ± 0.01) are the highest values ever reported for the saturated deep-blue OLEDs up to now. Moreover, although the doping concentration of them changes such large span as 10–20 wt%, the deviation for both the EL efficiency and the brightness always keep within a very small range during almost the whole driving process, which should lead to the easy and reproducible fabrication process of high performance blue OLEDs.

Highly efficient blue OLEDs employing an aromatic enyne derivative (E)-CPEY doped in the CBP host with the easily controlled doping concentrations as the emitters, are developed. The resulting EL devices with the pure and stable blue light (0.15, 0.10 ± 0.01) not only show relatively insensitive EL performances to the doping concentration changing in a high and wide range of 10 (for device II)-20 (for device III) wt%, but also exhibit the highest EL efficiencies (>8.5 cd A−1, >5.5 lm W−1 and ⩾6.0%) ever reported for the saturated deep-blue OLEDs up to now.Figure optionsDownload as PowerPoint slideHighlights
► OLEDs based on aromatic enyne compound exhibit pure blue emission.
► The blue OLEDs show high EL efficiency in wide doping-concentration range.
► The highest EL efficiency ever reported for the saturated deep-blue OLEDs are presented.