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Scale-up Chemical Synthesis of Thermally-activated Delayed Fluorescence Emitters Based on the Dibenzothiophene-S,S-Dioxide Core

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Solution-processed high-efficiency organic phosphorescent devices utilizing a blue Ir(III) complex.

Eunsil Han¹, Yi-Yeol Lyu, Tae-Woo Lee

¹Samsung Advanced Institute of Technology, Giheung-Gu, Youngin-Si, Gyeonggi-Do, 446-712, Korea.

Journal of Nanoscience and Nanotechnology

|August 7, 2008

Summary

High-efficiency blue phosphorescence organic light-emitting devices were fabricated using a solution process. Polystyrene matrices improved device performance compared to polymethylmethacrylate, achieving high luminous efficiency.

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Development of Efficient OLEDs from Solution Deposition

Development of Efficient OLEDs from Solution Deposition

Published on: November 4, 2022

Area of Science:

Materials Science
Organic Electronics
Photophysics

Background:

Organic light-emitting diodes (OLEDs) are crucial for display and lighting technologies.
Developing efficient and stable blue phosphorescent emitters remains a significant challenge.
Solution processing offers a cost-effective alternative to vacuum deposition for OLED fabrication.

Purpose of the Study:

To investigate the performance of solution-processed blue phosphorescent OLEDs.
To evaluate the impact of host matrix materials (polystyrene and polymethylmethacrylate) on device efficiency and color purity.
To understand the role of dopant confinement within polymer matrices.

Main Methods:

Fabrication of OLED devices using a blue Ir(III) complex [(F2ppy)2Ir(ph-imz)CN] blended with mCP host and inert polymers (PS, PMMA) via solution processing.
Characterization of dopant confinement using field emission transmission electron microscopy (FE-TEM) and atomic force microscopy (AFM).
Photoluminescence spectroscopy to determine emission characteristics and CIE color coordinates.

Main Results:

The blue Ir(III) complex exhibited photoluminescence peaked at 458 nm.
Devices fabricated with polystyrene (PS) showed superior performance over those with polymethylmethacrylate (PMMA).
The PS-based device achieved a maximum luminous efficiency of 5.11 cd/A with CIE color coordinates (0.17, 0.29) and a luminance of 9765 cd/m2.

Conclusions:

Solution-processed blue phosphorescent OLEDs can achieve high efficiency.
The choice of host polymer significantly influences device performance, with PS outperforming PMMA.
Dopant confinement within the polymer matrix plays a role in optimizing device characteristics.