Jayabharathi Jayaraman, Anudeebhana Jagathratchagan, Thanikachalam Venugopal, Sivaraj Sekar
Department of Chemistry, Material Science Lab, Annamalai University Annamalai Nagar Tamilnadu-608 002 India
RSC Adv. 2020 Mar 2;10(15):8866-8879. doi: 10.1039/d0ra00658k. eCollection 2020 Feb 27.
Phenylamine phenanthroimidazole based bipolar compounds with donor-acceptor (D-A) architecture namely, 4-(1-(2,3-dihydrobenzo[][1,4]dioxin-5-yl)-6,9-di(pyren-4-yl)-1-phenanthro[9,10-]imidazol-2-yl)-,-diphenylaniline (DDPPPA) and 4'-(1-(2,3-dihydrobenzo[][1,4]dioxin-5-yl)-6,9-di(pyren-4-yl)-1-phenanthro[9,10-]imidazol-2-yl)-,-diphenyl-[1,1'-biphenyl]-4-amine (DDPBA) have been synthesized with highly fluorescent pyrene moieties at C6- and C9-positions. The C6 and C9 modification enhanced the thermal, photochemical and electroluminescent properties. Both molecules were employed as blue emitters in non doped organic light emitting devices (OLEDs) and show high performances due to hybridized local and charge-transfer properties. An OLED with DDPPPA/DDPBA emissive layer shows deep-blue emission with maximum external quantum efficiency ( ), current efficiency ( ) and power efficiency ( ) of 5.7/6.0%, 10.5/12.0 cd A and 8.3/9.2 lm W, respectively. Both devices show high singlet exciton utilizing efficiency ( ) of DDPPPA-31.33% and DDPBA-35.29%. The doped device -MTDATA:DDPPPA/-MTDATA:DDPBA shows maximum efficiencies of -7.4/8.23 cd A; -5.8/6.13 lm W; -4.72/5.63% (5 wt%): -8.36/9.15 cd A; -6.32/6.65 lm W; -4.86/5.45% (10 wt%): -9.58/10.02 cd A; -7.8/8.25 lm W; -5.96/6.25% (20 wt%). The doped device based on TAPC host TAPC:DDPPPA/TAPC:DDPBA exhibits maximum efficiencies of -9.60/10.03 cd A; -7.81/8.26 lm W; -5.96/6.25% (20 wt%).
基于供体-受体（D-A）结构的苯胺菲并咪唑基双极化合物，即4-(1-(2,3-二氢苯并[][1,4]二恶英-5-基)-6,9-二(芘-4-基)-1-菲并[9,10-]咪唑-2-基)-,-二苯胺（DDPPPA）和4'-(1-(2,3-二氢苯并[][1,4]二恶英-5-基)-6,9-二(芘-4-基)-1-菲并[9,10-]咪唑-2-基)-,-二苯基-[1,1'-联苯]-4-胺（DDPBA）已在C6和C9位合成了具有高荧光性的芘部分。C6和C9修饰增强了热、光化学和电致发光性能。这两种分子都被用作非掺杂有机发光器件（OLED）中的蓝色发射体，由于具有杂化的局域和电荷转移特性而表现出高性能。具有DDPPPA/DDPBA发射层的OLED显示出深蓝色发射，最大外量子效率（ ）、电流效率（ ）和功率效率（ ）分别为5.7/6.0%、10.5/12.0 cd A和8.3/9.2 lm W。两种器件都显示出较高的单线态激子利用效率（ ），DDPPPA为31.33%，DDPBA为35.29%。掺杂器件-MTDATA:DDPPPA/-MTDATA:DDPBA显示出最大效率为 -7.4/8.23 cd A； -5.8/6.13 lm W； -4.72/5.63%（5 wt%）： -8.36/9.15 cd A； -6.32/6.65 lm W； -4.86/5.45%（10 wt%）： -9.58/10.02 cd A； -7.8/8.25 lm W； -5.96/6.25%（20 wt%）。基于TAPC主体的掺杂器件TAPC:DDPPPA/TAPC:DDPBA表现出最大效率为 -9.60/10.03 cd A； -7.81/8.26 lm W； -5.96/6.25%（20 wt%）。
