A Light Scattering Layer for Internal Light Extraction of Organic Light-Emitting Diodes Based on Silver Nanowires.
We propose and fabricate a random light scattering layer for light extraction in organic light-emitting diodes (OLEDs) with silver nanodots, which were obtained by melting silver nanowires. The OLED with the light scattering layer as an internal light extraction structure was enhanced by 49.1% for the integrated external quantum efficiency (EQE). When a wrinkle structure is simultaneously used for an external light extraction structure, the total enhancement of the integrated EQE was 65.3%. The EQE is maximized to 65.3% at a current level of 2.0 mA/cm(2). By applying an internal light scattering layer and wrinkle structure to an OLED, the variance in the emission spectra was negligible over a broad viewing angle. Power mode analyses with finite difference time domain (FDTD) simulations revealed that the use of a scattering layer effectively reduced the waveguiding mode while introducing non-negligible absorption. Our method offers an effective yet simple approach to achieve both efficiency enhancement and spectral stability for a wide range of OLED applications.
Soft I/O Interface Research Section, Electronics and Telecommunications Research Institute , Daejeon 34129, Republic of Korea.|Display and Nanosystem Laboratory, College of Engineering, Korea University , Seoul 136-713, Republic of Korea.
Keunsoo
K
Lee
Soft I/O Interface Research Section, Electronics and Telecommunications Research Institute , Daejeon 34129, Republic of Korea.|Research Institute of Electrical Communication, Tohoku University , Sendai, Miyagi 980-8577, Japan.
Jin-Wook
JW
Shin
School of Electrical Engineering, Pusan National University , Pusan (Busan) 609-735, Republic of Korea.
Jun-Hwan
JH
Park
Soft I/O Interface Research Section, Electronics and Telecommunications Research Institute , Daejeon 34129, Republic of Korea.
Jonghee
J
Lee
Soft I/O Interface Research Section, Electronics and Telecommunications Research Institute , Daejeon 34129, Republic of Korea.
Chul Woong
CW
Joo
Soft I/O Interface Research Section, Electronics and Telecommunications Research Institute , Daejeon 34129, Republic of Korea.
Jeong-Ik
JI
Lee
Soft I/O Interface Research Section, Electronics and Telecommunications Research Institute , Daejeon 34129, Republic of Korea.
Doo-Hee
DH
Cho
Soft I/O Interface Research Section, Electronics and Telecommunications Research Institute , Daejeon 34129, Republic of Korea.
Jong Tae
JT
Lim
School of Electrical Engineering, Pusan National University , Pusan (Busan) 609-735, Republic of Korea.
Min-Cheol
MC
Oh
Display and Nanosystem Laboratory, College of Engineering, Korea University , Seoul 136-713, Republic of Korea.
Byeong-Kwon
BK
Ju
Soft I/O Interface Research Section, Electronics and Telecommunications Research Institute , Daejeon 34129, Republic of Korea.
Jaehyun
J
Moon
finite difference time domain; light extraction; organic light-emitting diodes; silver nanowires; wrinkle structures