CAJ | 학술논문

选用了具有代表性的过渡金属元素Cd、Zn以及主族元素Ca、Mg作为中心金属离子,合成了基于2-(2-吡啶基)苯并咪唑(PBM)配体的系列金属配合物.实验数据表明这些配合物是一类具有高的荧光量子产率并且化学性质稳定的蓝色发光材料. 研究了该类配合物的光致发光性质以及中心金属离子半径大小对配合物发射峰位的影响,比较了中性配合物、配阳离子型配合物的发光性质以及这类金属离子微扰配体发光受其因素的影响.
선용료구유대표성적과도금속원소Cd、Zn이급주족원소Ca、Mg작위중심금속리자,합성료기우2-(2-필정기)분병미서(PBM)배체적계렬금속배합물.실험수거표명저사배합물시일류구유고적형광양자산솔병차화학성질은정적람색발광재료. 연구료해류배합물적광치발광성질이급중심금속리자반경대소대배합물발사봉위적영향,비교료중성배합물、배양리자형배합물적발광성질이급저류금속리자미우배체발광수기인소적영향.
It is well known that blue-emitting materials are so important to organic light-emitting diodes for the purpose of full color display. However, up to now, excellent blue-emitting materials have been underdeve-loped and lacked variousness. In this report, we developed a new kind of material which can emit highly efficient blue light, with 2-(2- pyridine)benzimidazole as the ligand, and using representative main elements Mg, Ca and transition metal Zn, Cd as central ion. Highly luminescent complexes are successfully synthesized and excellent blue-emitting complexes are realized. They all display strongly blue emissions and high luminescence quantum efficiencies. The emission peak located at the deep blue region of 400～455 nm, with high photoluminescence quantum yields of 0.31～0.74. In addition, all the blue-emitting complexes with melting points of no less than 250 ℃ own high thermal stability. All these data suggested that these blue-emitting complexes are promising materials in the field of organic light emitting diodes. In order to get a further understan-ding on the factors that dominate the blue luminescence complexes, chemical means are used to adjust their emission peak position. Compared with neutral and ionic complexes, we came to a conclusion that the emissions are assigned to intraligand transitions of the deprotonated ligand. On the other hand, even though the metal ions do not participate the luminescence process, the metal ions in the complexes do play a key role in stabilizing the deprotonated ligand and promoting the luminescence. Considering the promising properties of these blue-emitting complexes, including their high PL efficiency, thermal stability and the blue PL spectra, it was believed that these complexes may find potential applications in the field of organic light-emitting diodes, and corresponding efforts are now being preceded.