Effect of the Length of Side Group Substitution on Optical and Electroluminescene Properties

[摘要] Blue emitting materials, 9,10-bis-biphenyl-4-yl-anthracene (AC-P), 9,10-bis-[1,1`;4`,1``]terphenyl-4-yl-anthracene (AC-DP), and 9,10-bis[3``,5``-deiphenyltriphenyl-4`-yl]anthracene (AC-TP) were synthesized through boration and Suzuki aryl-aryl coupling reaction. EL performance of blue light-emitters was optimized and improved by varying the chemical structures of the side groups. In the thin film state, the three materials exhibit PLmax values in the range of 442-456 nm. EL device with the synthesized compounds in the following configuration was fabricated: ITO/4,4`,4``-tris(N-(2-naphthyl)-N-phenylamino)triphenylamine (2-TNATA) 60nm/N,N`-bis (naphthalene-1-yl)-N,N`-bis(phenyl)benzidine (NPB) 15nm/synthesized blue emitting materials (30nm)/1,3,5- tri(1-phenyl-1H-benzo[d]imidazol-2-yl)phenyl (TPBi) 20nm/LiF 1nm/Al 200nm. The current efficiency and C.I.E. value of AC-TP were 3.87 cd/A and (0.15, 0.12). A bulky and non-planar side group helps to prevent π-π* stacking interaction, which should lead to the formation of more reliable amorphous film. This is expected to have a positive effect on the high efficiency of the operating OLED device.

[学科分类] 化学（综合）

[关键词] OLED;Blue emitter;Anthracene derivatives