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문대규,최현준,이학원,원종훈,김록현 순천향대학교 부설 산업기술연구소 2019 순천향 산업기술연구소논문집 Vol.25 No.1
Organic light emitting diodes (OLEDs) are one of the most promising technologies for general solid state lighting applications and flat panel displays. Because they offer many advantages of high resolution, low power consumption, large area display, thin film and flexibility. A thermal evaporation method has been mainly used as an organic thin film forming method. On the other hand, solution processes provide several advantages of low-cost and simple process and large area fabrication, We made thin films that are hole transport layer (HTL) and Emissive layer (EML) which is layer to combine electron and hole to use solution process. The poly-TPD was used as a HTL. Beacasue poly-TPD has a high hole mobility. The CBP used as a host of a EML doped with fluorescent dopant Rubrene. EML solution obtained by dissolving CBP : Rubrene in 4wt% and 8wt% of Tetrahydrofuran. As a result, driving voltage and current efficiency improved when applying HTL and the best device characteristics were confirmed when the dopant concentration was 4%.
Rubrene 도핑층을 이용한 백색 OLEDs의 전기 및 광학적 특성
문대규,이찬재,한정인,Moon, Dae-Gyu,Lee, Chan-Jae,Han, Jeong-In 한국전기전자재료학회 2007 전기전자재료학회논문지 Vol.20 No.1
We have fabricated organic white light emitting diodes by mixing two colors from very thin rubrene doped and non-doped DPVBi layers. The device structure was ITO/2-TNATA(15 nm)/${\alpha}$-NPD(35 nm)/DPVBi:rubrene(5 nm)/DPVBi(30 nm)/$Alq_{3}(5\;nm)$/BCP(5 nm)/LiF(0.5 nm)/Al(150 nm). The yellow-emitting rubrene of 0.7 wt % was doped into the blue-emitting DPVBi host for the white light. CIE coordinate of the device was (0.31, 0.33) at 8 V. The color coordinates were stable at wide ranges of driving voltages. The luminance was over $1,000\;cd/m^{2}$ at 8 V and increases to $14,500\;cd/m^{2}$ at 12 V. The maximum current efficiency of the device was 8.2 cd/A at $200\;cd/m^{2}$.
문대규,Moon, Dae-Gyu 한국진공학회 2014 진공 이야기 Vol.1 No.2
Transparent and top emission organic light-emitting device (OLEDs) are the important issues in realizing new display applications such as see-through electronic displays, and flexible displays. The cathode of the transparent and top emission OLEDs should be transparent in the visible light and should not give any damage to the underlying organic layers, in addition to its intrinsic role of injecting electrons into the organic layers. Several authors have investigated the transparent conducting oxide films prepared by sputtering methods. They have introduced the sophisticated sputtering process for reducing the damages. Other groups have developed thermally evaporated transparent cathodes which are believed to be damage free without causing any permanent defect to the organic layers. This review focuses on the vacuum evaporated damage free transparent cathodes.
New ETL 층에 의한 저전압 구동 백색 발광 OLED
문대규,Moon, Dae-Gyu 한국전기전자재료학회 2009 전기전자재료학회논문지 Vol.22 No.3
We have developed low driving voltage white organic light emitting diode with a new electron transport material, triphenylphosphine oxide ($Ph_{3}PO$). The white light emission was realized with a rubrene yellow dopant and blue-emitting DPVBi layer. The new electron transport layer results in a very high current density at low voltage, resulting in a reduction of driving voltage. The device with a new electron transport layer shows a brightness of $1150\;cd/m^2$ at a low driving voltage of 4.3 V.
V2O2를 이용한 RED QD-LED의 전기 및 광학적 특성
문대규,박승준,김준민,김태영,문혜린,박다영 순천향대학교 부설 산업기술연구소 2019 순천향 산업기술연구소논문집 Vol.25 No.1
QLED has recently received spotlight as an outstanding next generation display connecting OLED. QLED is known to have high luminous efficiency and vivid colors, however, it is also known to have low stability and durability. Therefore, we made a device which used a V2O2for a hole injection layer (HIL) to improve characteristics of the element.V2O2 was spin-coated on the Indium-Tin-Oxide (ITO) glass and we used Indium Phosphide (InP) which is quantum dot material for emitting layer. As a result of comparative analysis of existence and nonexistence of V2O2 layer, the former device’s luminance is twice as good and has higher current efficiency which is about 12 %. As a result, it is considered that characteristics of the element were enhanced by using V2O2 which makes the injection of hole more smoothly.