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Yoon, Jhin-Yeong,Lee, Jeong Seob,Yoon, Seung Soo,Kim, Young Kwan Korean Chemical Society 2014 Bulletin of the Korean Chemical Society Vol.35 No.6
Two red emitters, 2-(7-(4-(diphenylamino)styryl)-2-methyl-4H-chromen-4-ylidene)malonitrile (Red 1) and 2-(7-(julolidylvinyl)-2-methyl-4H-chromen-4-ylidene)malonitrile (Red 2) have been designed and synthesized for application as red-light emitters in organic light emitting diodes (OLEDs). In these red emitters, the julolidine and triphenyl moieties were introduced to the emitting core as electron donors, and the chrome-derived electron accepting groups such as 2-methyl-(4H-chromen-4-ylidene)malononitrile were connected to electron donating moieties by vinyl groups. To explore the electroluminescence properties of these materials, multilayered OLEDs using red materials (Red 1 and Red 2) as dopants in $Alq_3$ host were fabricated. In particular, a device using Red 1 as the dopant material showed maximum luminous efficiencies and power efficiencies of 0.82 cd/A and 0.33 lm/W at $20mA/cm^2$. Also, a device using Red 2 as a dopant material presented the CIEx,y coordinates of (0.67, 0.32) at 7.0 V.
Yoon, Jhin-Yeong,Na, Eun Jae,Lee, Seok Jae,Kim, Young Kwan,Yoon, Seung Soo American Scientific Publishers 2015 Journal of Nanoscience and Nanotechnology Vol.15 No.2
<P>We have designed and synthesized three blue emitters based on 9-naphthylanthracene derivatives connected with various electron-withdrawing group such as 4-fluorobenzene, 2,4-difluorobenzene and 2,3,4,5,6-pentafluorobenzene (1-3). Multilayered OLEDs with the structure of ITO (180 nm)/NPB (50 nm)/Blue materials 1-3 (30 nm)/TPBi (15 nm)/Liq (2 nm)/AI (100 nm) have been fabricated to investigate their electroluminescent properties. In particular, the device using 3 showed efficient blue electroluminescent properties with a luminous, power, external quantum efficiency and CIE coordinates of 0.71 cd/A, 1.98 Im/W, 1.34% at 20 mA/cm2 and (x = 0.16, y = 0.20) at 10.0 V, respectively. In addition, a deep blue OLED using 1 with CIE coordinates (x = 0.15, y = 0.11) at 10.0 V exhibited a luminous, power, external quantum efficiency of 2.12 cd/A, 3.04 Im/W and 1.17% at 20 mA/cm2, respectively.</P>
Various Blue Emitting Materials Based on Pyrene Derivatives for Organic Light-Emitting Diodes.
Kim, Chanwoo,Yoon, Jhin-Yeong,Lee, Seok Jae,Lee, Ho Won,Kim, Young Kwan,Yoon, Seung Soo American Scientific Publishers 2015 Journal of Nanoscience and Nanotechnology Vol.15 No.7
<P>We designed and synthesized two pyrene derivatives: 1,6-di-1-naphthalenyl-pyrene (1) 1,6-Bis(10- phenyl-9-anthracenyl)-pyrene (2). Two OLED devices were fabricated in the following sequence: ITO (180 nm)/4,4'-bis(N-(1-naphthyl)-N-phenylamino)bipheny (NPB) (50 nm)/Blue materials 1 and 2 (40 nm)/Tris(8-hydroxyquinolinato)aluminium (Alq3) (15 nm)/lithium quinolate (Liq) (2.0 nm)/Al (100 nm). Two devices showed efficient blue emissions. Particularly, a device using 2 as emitting material showed blue EL properties with luminous efficiencies of 3.19 cd/A, power efficiencies of 1.54 lm/W, quantum efficiency of 2.42% at 500 cd/m2 and CIEx,y coordinates of (0.19, 0.16) at 7 V.</P>
Blue organic light-emitting diodes based on new bipolar anthracene derivatives containing pyridine.
Kwon, Sung Min,Yoon, Jhin-Yeong,Lee, Kum Hee,Kim, Bo Young,Lee, Seok Jae,Kim, Young Kwan,Yoon, Seung Soo American Scientific Publishers 2014 Journal of Nanoscience and Nanotechnology Vol.14 No.8
<P>A series of bipolar anthracene derivatives containing pyridine as an electron withdrawing group and cabazole, triphenylamine and indole as electron donating groups were synthesized and characterized. Particularly, Device E, 9-(4'-(10-(pyridin-2-yl)anthracen-9-yl)biphenyl-4-yl)-9H-carbazol exhibits a high-efficient deep-blue EL emission with the luminous efficiency (LE) of 2.31 cd/A, power efficiency (PE) of 1.39 lm/W and quantum efficiency (QE) of 1.94% at 500 nit. This compound shows the maximum wavelength of the electroluminescence (EL) at 467 nm and the CIE x, y coordinates of (0.16,0.14) at 6 V.</P>