Jayabharathi Jayaraman, Thanikachalam Venugopal, Ramya Ramaiyan, Panimozhi Sekar
Department of Chemistry, Annamalai University Annamalai nagar 608 002 Tamilnadu India
RSC Adv. 2019 Oct 21;9(58):33693-33709. doi: 10.1039/c9ra07509g. eCollection 2019 Oct 18.
Deep blue emitters with excellent stability, high quantum yield and multifunctionality are the major issues for full-color displays. In line with this, new multifunctional, thermally stable blue emitters , -(4-(10-(1-(2,3-dihydrobenzo[][1,4]dioxin-6-yl)-1-phenanthro[9,10-]imidazol-2-yl)anthracen-9-yl)phenyl)--phenylbenzenamine (DPIAPPB) and 2-(10-(9-carbazol-9-yl)anthracen-9-yl)-1-(2,3-dihydrobenzo[][1,4]dioxin-6-yl)-1-phenanthro[9,10-]imidazole (CADPPI) with hybridized local charge transfer state (HLCT) and hot exciton properties have been synthesized. These molecules show high photoluminescence quantum yield ( ): (DPIAPPB - 0.82/0.70 and CADPPI - 0.91/0.83). The CADPPI based device (EL - 467 nm) shows high efficiencies [ - 9.85 cd A; - 10.84 lm W; - 4.78% at 2.8 V; CIE (0.15, 0.10)] compared to the DPIAPPB device (EL - 472 nm) [ - 6.56 cd A; - 6.16 lm W; - 4.15% at 2.8 V with CIE (0.15, 0.12)]. The green device with CADPPI:Ir(ppy) exhibits a maximum - 59 012 cd m; - 16.8%; - 37.3 cd A; - 39.8 lm W with CIE (0.30, 0.60) and the red device with CADPPI:Ir(MDQ)(acac) shows a maximum - 43 456 cd m; - 21.9%; - 36.0 cd A; - 39.6 lm W with CIE (0.64, 0.35).
具有出色稳定性、高量子产率和多功能性的深蓝色发光体是全彩显示器的主要研究课题。与此相符的是，已合成出具有杂化局域电荷转移态（HLCT）和热激子特性的新型多功能、热稳定蓝色发光体，即 -（4 -（10 -（1 -（2,3 - 二氢苯并[][1,4]二恶英 - 6 - 基）- 1 - 菲并[9,10 -]咪唑 - 2 - 基）蒽 - 9 - 基）苯基）- - 苯基苯甲胺（DPIAPPB）和2 -（10 -（9 - 咔唑 - 9 - 基）蒽 - 9 - 基）- 1 -（2,3 - 二氢苯并[][1,4]二恶英 - 6 - 基）- 1 - 菲并[9,10 -]咪唑（CADPPI）。这些分子显示出高光致发光量子产率（ ）：（DPIAPPB - 0.82/0.70和CADPPI - 0.91/0.83）。基于CADPPI的器件（电致发光 - 467 nm）显示出比基于DPIAPPB的器件（电致发光 - 472 nm）更高的效率[ - 9.85 cd A； - 10.84 lm W；在2.8 V时 - 4.78%；CIE（0.15, 0.10）] [ - 6.56 cd A； - 6.16 lm W；在2.8 V时 - 4.15%，CIE（0.15, 0.12）]。具有CADPPI:Ir(ppy)的绿色器件显示出最大 - 59012 cd m； - 16.8%； - 37.3 cd A； - 39.8 lm W，CIE（0.30, 0.60），具有CADPPI:Ir(MDQ)(acac)的红色器件显示出最大 - 43456 cd m； - 21.9%； - 36.0 cd A； - 39.6 lm W，CIE（0.64, 0.35）。
