- An efficient red organic light-emitting diode using DCJTB type emitters based on silicone-containing julolidine derivatives
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This paper reports the synthesis and electroluminescent properties of new red fluorescent materials, 4-(dicyanomethylene)-2-(1,1-dimethyl-7- trimethylsiliyl methyl-julolidyl-9-enyl)-6-(4-pentylbicyclo[2.2.2]octan-1-yl)- 4H-pyran (DCJTMS) and 4-(dicyanomethylene)-2-(1,7-bistrimethylsiliylmethyl- julolidyl-9-enyl)-6-(4- pentylbicyclo[2.2.2]octan-1-yl)-4H-pyran (DCJDTMS). In these red emitters, the bulky groups such as trimethylsilane and n-pentyl-bicyclo[2,2,2]octane were introduced into and 4-(dicyanomethylene)-2- methyl-6-[p-(dimethylamino)-styryl]-4Hpyran (DCM) skeleton to increase the steric hindrance between the red emitters and prevent concentration quenching. An OLED device using 4-(dicyanomethylene)-2-(1,7- bis(trimethylsiliylmethyl)- julolidyl-9-enyl)-6-(4-pentylbicyclo[2.2.2]octan-1-yl)-4Hpyran (DCJDTMS) as a dopant exhibited the efficient red emission with a Luminous efficiency, Power efficiency and Commision Internationale De L'Eclairage (CIEx,y) coordinates of 3.66 cd/A, 2.13 lm/W at 20 mA/cm2 and (0.62, 0.38) at 7.0 V, respectively. Compared to device using 4-(dicyanomethylene)-2-(1,1,7,7-tetra- methyljulolidyl- 9-enyl)-6-tert-butyl-4H-pyran (DCJTB), the red device using DCJDTMS showed the greatly improved EL efficiency due to the more bulky substituents of compound DCJDTMS. Copyright Taylor & Francis Group, LLC.
- Lee, Kum Hee,Oh, Su Hyun,Park, Min Hye,Kim, Young Kwan,Yoon, Seung Soo
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- Red fluorescent organic light-emitting diodes (OLEDs) using 4-(1,3-Indanedione-2-yl)-2-(adaman-1-yl)-6-(10-aza-2,3,4,5,6, 7-hexahydronaphtio[1,8-gh]chromen-10(1 H)-one-9-enyl)-4H-pyran
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A red fluorescent material 4-(1,3-Indanedione-2-yl)-2-(adaman-1-yl)-6-(10- aza-2,3,4, 5,6,7-hexahydronaphtio[1,8-gh]chromen-10(1H)-one-9-enyl)-4H-pyran is synthesized and characterized. In this material, four methyl groups and adamantly group are introduced into DCJTB skeleton to increase steric hindrance between red emitters in the emitting layer of devices and thus improve the EL efficiencies by preventing concentration quenching. In particular, a device doped with this material in the emitting layer exhibits the luminous and power efficiencies of 3.58 cd/A and 1.61 lm/W at 20mA/cm2, respectively. The CIE coordinates of this device was (0.64, 0.35) at 7.0V. Copyright
- Jang, Heung Soo,Lee, Kum Hee,Na, Eun Jae,Yoon, Seung Soo,Kim, Young Kwan
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