π-Conjugated Aromatic Enynes as a Single-Emitting Component for White Electroluminescence

摘要

Carbazole-substituted aromatic enynes, such as (E)-CPEY, which are easily prepared by catalytic dimerization of a terminal alkyne, can act as an excellent single-emitting component for WOLEDs, as a result of combination of the blue emission from an isolated molecule with the longer-wavelength emissions (green and orange-red) from eximers. The (E)-CPEY-based double-layer device (device 3) emitted almost pure white light with CIE coordinates of (0.32, 0.33), maximum brightness of 1395 cd m~(-2), and maximum current efficiency of 2.07 cd A~(-1). To the best of our knowledge, this is the purest white emission with high luminescence and high efficiency ever reported for a single-emitting-component WOLED. The quality of the white emission remained almost unchanged under varying driving voltages, demonstrating an advantageous potential of single-emitting-component WOLEDs.