Date

Place

Room B (Room 324)
30. OLED Device I
August 20, 2015 (Thursday)
11:00 ~ 12:35

[30-2]
11:25 ~ 11:40
Title:Inverted Top-Emitting Organic Light-Emitting Diodes with a Multilayered Graphene Top Electrode
Hyunkoo Lee, Jong Tae Lim, Hyunsu Cho, Byoung-Hwa Kwon, Nam Sung Cho, Byoung-Gon Yu (ETRI, Korea), Seong Chu Lim (Sungkyunkwan Univ., Korea), and Jeong-Ik Lee (ETRI, Korea)
Abstract: ? ?Top-emitting (TE) OLEDs are of great interest because they have several advantages for active-matrix (AM) OLED displays such as diversity of substrate selection and large aperture ratio for high-resolution displays. However, transparent top electrode is one of critical issues in TEOLED. ? The graphene is transparent and theoretically very conductive as well as metal-free material, leading to reduce surface plasmon losses. In this work, we have fabricated inverted TEOLEDs by introducing multilayered graphene (MLG) as a top electrode. For laminating the MLG layer on the top organic layer in TEOLED, we use a bonding and a supporting layer which can be called graphene electrode tape (GET). The MLG/bonding layer/supporting layer structure is very transparent. In addition, this MLG electrode is electrically connected to the top organic layer in phosphorescent yellowish-green TEOLED which demonstrates high efficiency of about 47 cd/A at about 1000 cd/m2. We also investigate EL spectra of the white inverted TEOLEDs with a MLG top electrode depending on viewing angle. ?Above result is first reported TEOLEDs with graphene top electrode and we believe that this graphene electrode can be used various optoelectronic devices such as solar cells, quantum-dot devices as well as OLEDs.
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