Dual-periodic-microstructure-induced color tunable white organic light-emitting devices

doi:10.1007/s12200-016-0617-0

Front. Optoelectron.

2016, Vol. 9

Issue (2) : 283-289 https://doi.org/10.1007/s12200-016-0617-0

COMMUNICATION

Dual-periodic-microstructure-induced color tunable white organic light-emitting devices

Yangang BI¹, Jinhai JI¹, Yang CHEN¹, Yushan LIU¹, Xulin ZHANG¹, Yunfei LI¹, Ming XU¹, Yuefeng LIU¹, Xiaochi HAN¹, Qiang GAO¹(

), Hongbo SUN^1,²

¹. State Key Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, Changchun 130012, China
². College of Physics, Jilin University, Changchun 130023, China

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Abstract

In this paper, we demonstrate a color tunable white organic light-emitting devices (WOLEDs) based on the two complementary color strategies by introducing two-dimensional (2-D) dual periodic gratings. It is possible to tune the color in a range between cold-white and warm-white by simply operating the polarization of polarizer in front of the microstructured WOLEDs. Experimental and numerical results demonstrate that color tunability of the WOLEDs comes from the effect of the 2-D dual periodic gratings by exciting the surface plasmon-polariton (SPP) resonance associated with the cathode/organic interface. The electroluminescence (EL) performance of the WOLEDs have also been improved due to the effective light extraction by excitation and out-coupling of the SPP modes, and a 39.65% enhancement of current efficiency has been obtained compared to the conventional planar devices.

Keywords dual periodic grating surface plasmon-polariton (SPP) color tunable white organic light-emitting devices (WOLEDs)

Corresponding Author(s): Qiang GAO

Just Accepted Date: 25 February 2016 Online First Date: 31 March 2016 Issue Date: 05 April 2016

Cite this article:

Yangang BI,Jinhai JI,Yang CHEN, et al. Dual-periodic-microstructure-induced color tunable white organic light-emitting devices[J]. Front. Optoelectron., 2016, 9(2): 283-289.

URL:

https://academic.hep.com.cn/foe/EN/10.1007/s12200-016-0617-0
https://academic.hep.com.cn/foe/EN/Y2016/V9/I2/283

Fig.1 (a) AFM image of the 2-D dual periodic grating with period of 225 and 325 nm; (b) schematic structure of WOLEDs

Fig.2 Normalized EL spectra (a) and CIE coordinates (b) of the WOLEDs with 1-D 225 nm period, 1-D 325 nm period, and 2-D dual period grating with TM polarization (red), TE polarization (blue), and without polarization (black)

Fig.3 (a) Normalized absorption spectra of the 2-D dual periodic microstructured WOLEDs; (b) normalized TM polarized and TE polarized absorption spectra of the WOLEDs

Fig.4 Simulated distributions of the magnetic field intensity across the 2-D dual periodic corrugated WOLEDs under the 450 nm TM polarizated normal incident light (a) and 575 nm TE polarizated normal incident light (b)

Fig.5 EL performance of the corrugated and planar WOLEDs. Voltage-current (a) and luminance-current density-efficiency (b) characteristics of the corrugated and planar WOLEDs

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