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2-(2-Hydroxyphenyl)benzimidazole-based Four-Coordinate Boron-Containing Materials With Highly Efficient Deep-Blue Photoluminescence and Electroluminescence

2-(2-Hydroxyphenyl)benzimidazole-based Four-Coordinate Boron-Containing Materials With Highly Efficient Deep-Blue Photoluminescence and Electroluminescence

Zhenyu Zhang, Houyu Zhang, Chuanjun Jiao, Kaiqi Ye, Hongyu Zhang, Jingying Zhang, Yue Wang

Inorg Chem. 2015 Mar 16;54(6):2652-9.

PMID: 25714777

Abstract:

Two novel four-coordinate boron-containing emitters 1 and 2 with deep-blue emissions were synthesized by refluxing a 2-(2-hydroxyphenyl)benzimidazole ligand with triphenylborane or bromodibenzoborole. The boron chelation produced a new π-conjugated skeleton, which rendered the synthesized boron materials with intense fluorescence, good thermal stability, and high carrier mobility. Both compounds displayed deep-blue emissions in solutions with very high fluorescence quantum yields (over 0.70). More importantly, the samples showed identical fluorescence in the solution and solid states, and the efficiency was maintained at a high level (approximately 0.50) because of the bulky substituents between the boron atom and the benzimidazole unit, which can effectively separate the flat luminescent units. In addition, neat thin films composed of 1 or 2 exhibited high electron and hole mobility in the same order of magnitude 10(-4), as determined by time-of-flight. The fabricated electroluminescent devices that employed 1 or 2 as emitting materials showed high-performance deep-blue emissions with Commission Internationale de L'Eclairage (CIE) coordinates of (X = 0.15, Y = 0.09) and (X = 0.16, Y = 0.08), respectively. Thus, the synthesized boron-containing materials are ideal candidates for fabricating high-performance deep-blue organic light-emitting diodes.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP960714-A	Triphenylborane solution		960-71-4	Price

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