Syntheses, Properties of Luminescent Complexes with 2-(2-pyridyl)Benzimidazole Ligands

YUE Shu-mei; LI Na; WANG Bin-bin; LIN Shi-wei; SUN Er-jun

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Syntheses, Properties of Luminescent Complexes with 2-(2-pyridyl)Benzimidazole Ligands

paper | 更新时间：2020-08-12

- Syntheses, Properties of Luminescent Complexes with 2-(2-pyridyl)Benzimidazole Ligands
- Chinese Journal of Luminescence Vol. 30, Issue 6, Pages: 852-857(2009)
- 作者机构：
  
  长春师范学院化学学院,吉林长春,130032
- 作者简介：
- 基金信息：
- DOI：
  CLC： O482.31
- Received：20 June 2009，
  
  Revised：02 January 1900，
  
  Published Online：30 December 2009，
  
  Published：30 December 2009
- 稿件说明：
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YUE Shu-mei, LI Na, WANG Bin-bin, et al. Syntheses, Properties of Luminescent Complexes with 2-(2-pyridyl)Benzimidazole Ligands[J]. Chinese journal of luminescence, 2009, 30(6): 852-857.
DOI：

YUE Shu-mei, LI Na, WANG Bin-bin, et al. Syntheses, Properties of Luminescent Complexes with 2-(2-pyridyl)Benzimidazole Ligands[J]. Chinese journal of luminescence, 2009, 30(6): 852-857. DOI：

摘要

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。

Abstract

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.

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Keywords

references

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