Liu Yu, Nishiura Masayoshi, Wang Yue, Hou Zhaomin
Organometallic Chemistry Laboratory, RIKEN (The Institute of Physical and Chemical Research), Hirosawa 2-1, Wako, Saitama 351-0198, Japan.
J Am Chem Soc. 2006 May 3;128(17):5592-3. doi: 10.1021/ja058188f.
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.
通过使用有机镧系催化剂Me2Si(C5Me4)(NAr)Lu(CH2SiMe3)(THF)和(C5Me5)2LaCH(SiMe3)2，分别通过相应末端炔烃的催化二聚反应，以优异的区域选择性和立体选择性合成了咔唑取代的苯基烯炔(Z)-CPEY和(E)-CPEY。这些新型π共轭化合物，特别是(E)-烯炔异构体(E)-CPEY，由于孤立分子的蓝色发射与准分子的较长波长发射（绿色和橙红色）相结合，可作为白色有机发光器件（WOLED）的优异单发光组分。基于(E)-CPEY的双层器件发出几乎纯的白光，CIE坐标为(0.32, 0.33)，最大亮度为l395 cd m-2，最大电流效率为2.07 cd A-1。这可能是单发光组分WOLED报道过的最纯的白色发射。在不同驱动电压下，白色发射的质量几乎保持不变，表明单发光组分WOLED具有有利的潜力。
