Spirobifluorene Core-Based Novel Hole Transporting Materials for Red Phosphorescence OLEDs.
Two new hole transporting materials, namedHTM 1AandHTM 1B, were designed and synthesized in significant yields using the well-known Buchwald Hartwig and Suzuki cross- coupling reactions. Both materials showed higher decomposition temperatures (over 450 °C) at 5% weight reduction andHTM 1Bexhibited a higher glass transition temperature of 180 °C. Red phosphorescence-based OLED devices were fabricated to analyze the device performances compared to Spiro-NPB and NPB as reference hole transporting materials. Devices consist of hole transporting material asHTM 1Bshowed better maximum current and power efficiencies of 16.16 cd/A and 11.17 lm/W, at the same time it revealed an improved external quantum efficiency of 13.64%. This efficiency is considerably higher than that of Spiro-NPB and NPB-based reference devices.
Division of Bio-Nanochemistry, College of Natural Sciences, Wonkwang University, Chonbuk, Iksan 570-749, Korea. braveenth.czbt@gmail.com.
Ramanaskanda
R
Braveenth
Department of Information Display, Kyung Hee University, Dongdaemoon-gu, Seoul 130-701, Korea. hwbae@khu.ac.kr.
Hyeong Woo
HW
Bae
Division of Bio-Nanochemistry, College of Natural Sciences, Wonkwang University, Chonbuk, Iksan 570-749, Korea. quynhnpb2003@yahoo.com.
Quynh Pham Bao
QP
Nguyen
Division of Bio-Nanochemistry, College of Natural Sciences, Wonkwang University, Chonbuk, Iksan 570-749, Korea. hayeminko@wku.ac.kr.
Haye Min
HM
Ko
Division of Microelectronics and Display Technology, Wonkwang University, Iksan 570-749, Korea. chlee@wku.ac.kr.|Solar Cell Research Institute, Next Generation Industrial Radiation Technology RIC, Wonkwang University, Iksan 570-749, Korea. chlee@wku.ac.kr.|Department of Carbon Fusion Engineering, Wonkwang University, Iksan 570-749, Korea. chlee@wku.ac.kr.
Choong Hun
CH
Lee
Division of Microelectronics and Display Technology, Wonkwang University, Iksan 570-749, Korea. sarayeboa@naver.com.
Hyeong Jun
HJ
Kim
Department of Information Display, Kyung Hee University, Dongdaemoon-gu, Seoul 130-701, Korea. jhkwon@khu.ac.kr.
Jang Hyuk
JH
Kwon
Division of Bio-Nanochemistry, College of Natural Sciences, Wonkwang University, Chonbuk, Iksan 570-749, Korea. geuyoon@wonkwang.ac.kr.
Kyu Yun
KY
Chai
D005449:Fluorenes / Q000737:chemistry*; D049449:Luminescence; D055668:Photochemical Processes; D011789:Quantum Theory; D013141:Spiro Compounds / Q000138:chemical synthesis* / Q000737:chemistry
D005449:Fluorenes; D013141:Spiro Compounds; C041509:fluorene
hole transporting materials; organic light emitting diodes; red phosphorescence; spirobifluorene