Effect of the Length of Side Group Substitution on Optical and Electroluminescene Properties
作者:Hwangyu Shin、Hyeonmi Kang、Beomjin Kim、Youngil Park、Young-Jun Yu、Jongwook Park
DOI:10.5012/bkcs.2014.35.10.3041
日期:2014.10.20
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 $PL_max}$ 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 $\pi}-\pi}^*$ 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.
通过溴化和铃木芳基芳基偶联反应,合成了 9,10-双联苯-4-基-蒽(AC-P)、9,10-双[1,1';4',1"]三联苯-4-基-蒽(AC-DP)和 9,10-双[3",5"-二联苯三苯基-4'-基]蒽(AC-TP)等蓝色发光材料。通过改变侧基的化学结构,优化并改善了蓝光发光体的 EL 性能。在薄膜状态下,这三种材料的 $PL_max}$ 值范围为 442-456 nm。我们用合成的化合物制作了以下结构的电致发光器件:ITO/4,4',4"-tris(N-(2-naphthyl)-N-phenylamino)triphenylamine (2-TNATA) 60nm/N,N'-bis (naphthalene-1-yl)-N、N,N'-双(苯基)联苯胺(NPB)15 纳米/合成蓝色发光材料(30 纳米)/1,3,5-三(1-苯基-1H-苯并[d]咪唑-2-基)苯基(TPBi)20 纳米/LiF 1 纳米/Al 200 纳米。AC-TP 的电流效率和 C.I.E. 值分别为 3.87 cd/A 和 (0.15, 0.12)。笨重的非平面侧基有助于防止$\pi}-pi}^*$堆叠作用,从而形成更可靠的无定形薄膜。预计这将对运行中的 OLED 设备的高效率产生积极影响。