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Molecules. 2018 Mar 21;23(4). pii: E713. doi: 10.3390/molecules23040713.

Utilizing a Spiro Core with Acridine- and Phenothiazine-Based New Hole Transporting Materials for Highly Efficient Green Phosphorescent Organic Light-Emitting Diodes.

Author information

1
Division of Bio-Nanochemistry, College of Natural Sciences, Wonkwang University, Iksan City, Chonbuk 570-749, Korea. braveenth.czbt@gmail.com.
2
Nano-Convergence Research Center, Korea Electronics Technology Institute, Jeonju 54853, Korea. ijbae@keti.re.kr.
3
Division of Bio-Nanochemistry, College of Natural Sciences, Wonkwang University, Iksan City, Chonbuk 570-749, Korea. wlgns3931@naver.com.
4
Division of Bio-Nanochemistry, College of Natural Sciences, Wonkwang University, Iksan City, Chonbuk 570-749, Korea. wuqiong9308@126.com.
5
Division of Bio-Nanochemistry, College of Natural Sciences, Wonkwang University, Iksan City, Chonbuk 570-749, Korea. guksun92@daum.net.
6
Division of Bio-Nanochemistry, College of Natural Sciences, Wonkwang University, Iksan City, Chonbuk 570-749, Korea. raagulan@live.com.
7
Division of Bio-Nanochemistry, College of Natural Sciences, Wonkwang University, Iksan City, Chonbuk 570-749, Korea. kihun0432@wku.ac.kr.
8
Division of Bio-Nanochemistry, College of Natural Sciences, Wonkwang University, Iksan City, Chonbuk 570-749, Korea. dudgml9192@naver.com.
9
Nano-Convergence Research Center, Korea Electronics Technology Institute, Jeonju 54853, Korea. miy1kim@keti.re.kr.
10
Division of Bio-Nanochemistry, College of Natural Sciences, Wonkwang University, Iksan City, Chonbuk 570-749, Korea. geuyoon@wonkwang.ac.kr.

Abstract

Two new hole transporting materials, 2,7-bis(9,9-diphenylacridin-10(9H)-yl)-9,9' spirobi[fluorene] (SP1) and 2,7-di(10H-phenothiazin-10-yl)-9,9'-spirobi[fluorene] (SP2), were designed and synthesized by using the Buchwald-Hartwig coupling reaction with a high yield percentage of over 84%. Both of the materials exhibited high glass transition temperatures of over 150 °C. In order to understand the device performances, we have fabricated green phosphorescent organic light-emitting diodes (PhOLEDs) with SP1 and SP2 as hole transporting materials. Both of the materials revealed improved device properties, in particular, the SP2-based device showed excellent power (34.47 lm/W) and current (38.41 cd/A) efficiencies when compare with the 4,4'-bis(N-phenyl-1-naphthylamino)biphenyl (NPB)-based reference device (30.33 lm/W and 32.83 cd/A). The external quantum efficiency (EQE) of SP2 was 13.43%, which was higher than SP1 (13.27%) and the reference material (11.45%) with a similar device structure. The SP2 hole transporting material provides an effective charge transporting path from anode to emission layer, which is explained by the device efficiencies.

KEYWORDS:

acridine; green phosphorescence; hole transporting materials; organic light-emitting diodes; phenothiazine; spirobifluorene

PMID:
29561800
DOI:
10.3390/molecules23040713
[Indexed for MEDLINE]
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