1416893-92-9Relevant academic research and scientific papers
Highly efficient dual-core derivatives with EQEs as high as 8.38% at high brightness for OLED blue emitters
Kang, Seokwoo,Jung, Hyocheol,Lee, Hayoon,Park, Sunwoo,Kim, Joonghan,Park, Jongwook
supporting information, p. 14709 - 14716 (2019/12/06)
Three blue fluorescent materials were newly synthesized by attaching triphenylamine side groups at their ortho, meta, and para positions to a dual core moiety of anthracene and pyrene, two chromophores with good luminous efficiency; these three materials were 2-(6-(10-(2-(diphenylamino)phenyl)anthracen-9-yl)pyren-1-yl)-N,N-diphenylaniline (o-TPA-AP-TPA), 3-(6-(10-(3-(diphenylamino)phenyl)anthracen-9-yl)pyren-1-yl)-N,N-diphenylaniline (m-TPA-AP-TPA), and 4-(6-(10-(4-(diphenylamino)phenyl)anthracen-9-yl)pyren-1-yl)-N,N-diphenylaniline (p-TPA-AP-TPA), respectively. The optical, thermal, and electroluminescence (EL) properties of the synthesized materials were measured. All three materials were found to be real blue emitters in the solution state and display high PLQY values. A device doped with p-TPA-AP-TPA displayed a very high efficiency of 9.14 cd A-1 and an EQE of 8.38% at a high luminance of 5000 cd m-2.
Synthesis and electroluminescence properties of new blue dual-core OLED emitters using bulky side chromophores
Lee, Suji,Kim, Beomjin,Jung, Hyocheol,Shin, Hwangyu,Lee, Hayoon,Lee, Jaehyun,Park, Jongwook
, p. 255 - 261 (2016/09/07)
Using a 1-anthracen-9-yl-pyrene (AP) dual-core emitter, two new emitters of blue light, 1-spiro-9,9′-bifluoren-4-yl-6-(10-spiro-9,9′-bifluoren-4-yl-anthracen-9-yl)-pyrene (DSF-AP) and 1-[2-(9H-carbazol-9-yl)phenyl]-6-[2-(9H-carbazol-9-yl)phenyl-anthracen-9-yl]-pyrene (DCP-AP), were synthesized through boration and the Suzuki aryl-aryl coupling reaction. These two materials exhibited PLmax values at 443?nm and 448?nm in a chloroform solution, and at 458?nm and 463?nm in a thin-film state. EL devices with the synthesized compounds were fabricated in the following configuration: ITO/4,4′,4″-tris(N-(2-naphthyl)-N-phenylamino)triphenylamine (2-TNATA) (60?nm)/N,N′-bis (naphthalene-1-yl)-N,N′-bis(phenyl)benzidine (NPB) (15?nm)/synthesized blue light-emitting materials (35?nm)/Tris-(8-hydroxyquinoline)aluminum (Alq3) (20?nm)/lithium fluoride (LiF) (1?nm)/Al (200?nm). Compared with the device made using an AP core lacking side groups, the device made with DCP-AP displayed 31% higher luminance efficiency (resulting in a value of 4.37?cd/A) and 32% higher power efficiency (to yield 1.93?lm/W), as well as a high external quantum efficiency (3.64%).
Excimer formation promoted by steric hindrance in dual core chromophore for organic light-emitting diodes emitters
Lee, Jaehyun,Kim, Beomjin,Park, Jongwook
, p. 8854 - 8857 (2016/07/27)
A new dual core derivative of 1-(3,5-dipyrid-3-yl-phenyl)-6-(10-(3,5-dipyrid-3-yl-phenyl)-anthracen-9-yl)-pyrene (3P-AP-3P) was synthesized by introducing pyridine groups. 1-[1,1';3',1"]Terphenyl-5'-yl-6-(10-[1,1';3',1"]terphenyl-5'-yl-anthracen-9-yl)-pyrene (TP-AP-TP) was used to compare with 3P-AP-3P. Unlike TP-AP-TP, 3P-AP-3P exhibited an excimer emission at 602 nm by introducing pyridine groups despite its highly twisted core. Two materials were used as emitting layer (EML) in OLED devices: ITO/2-TNATA (60 nm)/NPB (15 nm)/the synthesized materials (35 nm)/Alq3 (20 nm)/LiF (1 nm)/Al (200 nm). The 3P-AP-3P device exhibited EL maximum values at 463 nm and 601 nm.
Synthesis and electroluminescence properties of highly efficient dual core chromophores with side groups for blue emission
Lee, Hayoon,Kim, Beomjin,Kim, Seungho,Kim, Joonghan,Lee, Jaehyun,Shin, Hwangyu,Lee, Ji-Hoon,Park, Jongwook
, p. 4737 - 4747 (2014/06/23)
Highly efficient blue emitting materials consisting of dual core derivatives with phenyl and/or naphthyl side groups and asymmetric or symmetric structures were designed and synthesized. The asymmetric structures 1-naphthalen-1-yl-6-(10-phenyl-anthracen-9-yl)-pyrene (Ph-AP-Na) and 1-(10-naphthalen-1-yl-anthracen-9-yl)-6-phenyl-pyrene (Na-AP-Ph), and the symmetric structures 1-phenyl-6-(10-phenyl-anthracen-9-yl)-pyrene (Ph-AP-Ph) and 1-naphthalen-1-yl-6-(10-naphthalen-1-yl-anthracen-9-yl)-pyrene (Na-AP-Na) were synthesized. Of the synthesized compounds, Na-AP-Na was found to exhibit the highest EL device efficiency of 5.46 cd A-1. Ph-AP-Na, Na-AP-Ph, Ph-AP-Ph, and Na-AP-Na exhibit EL maximum values of real blue color in the range 455 nm to 463 nm. The y values of their color coordinates are within the range 0.125 to 0.142, so these compounds exhibit good blue color coordinates for displays. The lifetime of the Na-AP-Na device was more than three times longer than that of the AP dual core (1-anthracen-9-yl-pyrene) device. This journal is the Partner Organisations 2014.
