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Molecules 2017, 22(3), 464;

Spirobifluorene Core-Based Novel Hole Transporting Materials for Red Phosphorescence OLEDs

Division of Bio-Nanochemistry, College of Natural Sciences, Wonkwang University, Chonbuk, Iksan 570-749, Korea
Department of Information Display, Kyung Hee University, Dongdaemoon-gu, Seoul 130-701, Korea
Division of Microelectronics and Display Technology, Wonkwang University, Iksan 570-749, Korea
Solar Cell Research Institute, Next Generation Industrial Radiation Technology RIC, Wonkwang University, Iksan 570-749, Korea
Department of Carbon Fusion Engineering, Wonkwang University, Iksan 570-749, Korea
Authors to whom correspondence should be addressed.
Academic Editor: Jwo-Huei Jou
Received: 7 February 2017 / Revised: 7 March 2017 / Accepted: 12 March 2017 / Published: 14 March 2017
(This article belongs to the Special Issue Organic Light Emitting Diodes)
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Two new hole transporting materials, named HTM 1A and HTM 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 and HTM 1B exhibited 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 as HTM 1B showed 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. View Full-Text
Keywords: organic light emitting diodes; hole transporting materials; red phosphorescence; spirobifluorene organic light emitting diodes; hole transporting materials; red phosphorescence; spirobifluorene

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Braveenth, R.; Bae, H.W.; Nguyen, Q.P.B.; Ko, H.M.; Lee, C.H.; Kim, H.J.; Kwon, J.H.; Chai, K.Y. Spirobifluorene Core-Based Novel Hole Transporting Materials for Red Phosphorescence OLEDs. Molecules 2017, 22, 464.

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