• 한국재료학회지
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• 제18권7호
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• pp.347-351
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• 2008

We have fabricated and evaluated newNew high high-efficiency green green-light light-emitting phosphorescent devices with an emission layer of [$TCTA/TCTA_{1/3}TAZ_{2/3}/TAZ$] : $Ir(ppy)_3$ were fabricated and evaluated, and compared the electroluminescence characteristics of these devices were compared with the conventional phosphorescent devices with emission layers of ($TCTA_{1/3}TAZ_{2/3}$) : $Ir(ppy)_3$ and (TCTA/TAZ) : $Ir(ppy)_3$. The current density, luminance, and current efficiency of the a device with an emission layer of ($80{\AA}-TCTA/90^{\circ}{\AA}-TCTA_{1/3}TAZ_{2/3}/130{\AA}-TAZ$) : 10%-$Ir(ppy)_3$ were $95\;mA/cm^2$, $25000\;cd/m^2$, and 27 cd/A at an applied voltage of 10 V, respectively. The maximum current efficiency was 52 cd/A under the a luminance value of $400\;cd/m^2$. The peak wavelength and FWHM (FWHM (full width at half maximum) in the electroluminescence spectral were 513 nm and 65 nm, respectively. The color coordinate was (0.30, 0.62) on the CIE (Commission Internationale de I'Eclairage) chart. Under the a luminance of $15000\;cd/m^2$, the current efficiency of the a device with an emission layer of ($80{\AA}-TCTA/90{\AA}-TCTA_{1/3}TAZ_{2/3}/130{\AA}-TAZ$) : 10%-$Ir(ppy)_3$ was 34 cd/A, which has beenshowed an improvement of improved 1.7 and 1.4 times compared to those of the devices with emission layers of ($300{\AA}-TCTA_{1/3}TAZ_{2/3}$) : 10%-$Ir(ppy)_3$ and ($100{\AA}-TCTA/200{\AA}$-TAZ) : 10%-$Ir(ppy)_3$, respectively.

• 전기전자학회논문지
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• 제24권3호
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• pp.699-705
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• 2020

본 연구에서는 유기전기발광소자의 전기적 특성을 향상시키기 위한 방법으로, 용액공정 도핑법이 도입된 고분자 poly[(9,9-dioctylfluorenyl-2,7-diyl)-co-(4,4′-(N-(4-sec-butylphenyl)diphenylamine)] (TFB)기반의 정공수송층을 제안하였다. 정공수송층 소재 TFB 용액 내에 1,4,5,8,9,11-hexaazatriphenylene hexacarbonitrile (HAT-CN)를 3 wt% 도핑을 하여 정공수송층의 전기적 특성을 향상 시켰다. 이를 통해 HAT-CN이 도핑된 TFB을 이용한 유기전기발광소자에서는 향상된 정공수송층의 전도도를 통해 동일 구동 전압 시 전류 밀도와 휘도가 증가하였고, 점등 개시 전압이 13V에서 9V로 줄어드는 것을 확인하였다. 또한, 도핑법이 적용되지 않은 기준 소자 대비 최대 외부양자효율이 3.6%에서 10.8%로 약 3배 향상 되는 것을 확인하였다.