Polarized red, green, and blue light emitting diodes fabricated with identical device configuration using rubbed PEDOT:PSS as alignment layer

doi:10.1088/1674-1056/28/7/078108

Abstract

Polarized red, green, and blue light emitting diodes (LEDs) are successfully fabricated using polyfluorene and its derivatives, namely, poly (9,9-dioctylfluorene) (PFO), poly (9,9-dioctylfluorene-co-benzothiadiazole) (F8BT), and poly (triphenylamine-co-4,7-di(thiophen-2-yl)benzo[c] [1,2,5]thiadiazole-co-benzo[c]thiadiazole-co-9,9-dioctyl-9H-fluorene) (Red F). Rubbed hole transport layer poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS) is employed in the devices as the alignment layer to achieve fully monodomain alignment in all polymer layers. Red F is blended with F8BT to realize the polarized electroluminescence of red light (dichroic ratio~3.3), despite having no liquid crystallinity itself. Comparing PFO/F8BT blend to F8BT, higher efficiency of polarized emission is found due to the energy transfer. All the polarized LEDs exhibit pronounced dichroism and efficient polarized emission compared to the non-alignment regular devices.

Keywords: organic semiconductors light-emitting devices polymer liquid crystals display devices

Received: 18 April 2019
Revised: 17 May 2019
Accepted manuscript online:

PACS:	81.05.Fb	(Organic semiconductors)
	85.60.Jb	(Light-emitting devices)
	61.30.Vx	(Polymer liquid crystals)
	42.79.Kr	(Display devices, liquid-crystal devices)

Fund:

Project supported by the National Natural Science Foundation of China (Grant Nos. 61874058, 51861145301, and 61376023), the National Key Basic Research Program of China (Grant No. 2015CB932203), China Postdoctoral Science Foundation (Grant No. 2018M642283), the Synergetic Innovation Center for Organic Electronics and Information Displays, China, and the Priority Academic Program Development Fund of Jiangsu Higher Education Institutions (PAPD) in China.

Corresponding Authors: Qi Zhang, Ruidong Xia
E-mail: iamqzhang@njupt.edu.cn;iamrdxia@njupt.edu.cn

Cite this article:

Haoran Zhang(张皓然), Qi Zhang(张琪), Qian Zhang(张茜), Huizhi Sun(孙汇智), Gang Hai(海港), Jing Tong(仝静), Haowen Xu(徐浩文), Ruidong Xia(夏瑞东) Polarized red, green, and blue light emitting diodes fabricated with identical device configuration using rubbed PEDOT:PSS as alignment layer 2019 Chin. Phys. B 28 078108

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Polarized red, green, and blue light emitting diodes fabricated with identical device configuration using rubbed PEDOT:PSS as alignment layer

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