Pi-conjugated aromatic enynes as a single-emitting component for white electroluminescence

Yu Liu; Masayoshi Nishiura; Yue Wang; Zhaomin Hou

doi:10.1021/ja058188f

Pi-conjugated aromatic enynes as a single-emitting component for white electroluminescence

J Am Chem Soc. 2006 May 3;128(17):5592-3. doi: 10.1021/ja058188f.

Authors

Yu Liu¹, Masayoshi Nishiura, Yue Wang, Zhaomin Hou

Affiliation

¹ Organometallic Chemistry Laboratory, RIKEN (The Institute of Physical and Chemical Research), Hirosawa 2-1, Wako, Saitama 351-0198, Japan.

PMID: 16637599
DOI: 10.1021/ja058188f

Abstract

By use of the organolanthanide catalysts Me2Si(C5Me4)(NAr)Lu(CH2SiMe3)(THF) and (C5Me5)2LaCH(SiMe3)2, carbazole-substituted phenyl enynes (Z)-CPEY and (E)-CPEY were synthesized, respectively, with excellent regio- and stereoselectivity through the catalytic dimerization of the corresponding terminal alkyne. These new pi-conjugated compounds, in particular, the (E)-enyne isomer (E)-CPEY, act as an excellent single-emitting component for white organic light-emitting devices (WOLEDs), as a result of combination of the blue emission from an isolated molecule with the longer-wavelength emissions (green and orange-red) from excimers. The (E)-CPEY-based double-layer device 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. This is perhaps the purest white emission 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.