Jump to main content
Jump to site search
SCHEDULED MAINTENANCE Close the message box

Maintenance work is planned for Monday 16 August 2021 from 07:00 to 23:59 (BST).

Website performance may be temporarily affected and you may not be able to access some PDFs or images. If this does happen, refreshing your web browser should resolve the issue. We apologise for any inconvenience this might cause and thank you for your patience.


Issue 23, 2019

High efficiency warm white organic light-emitting diodes with precise confinement of charge carriers and excitons in the exciplex host system

Author affiliations

Abstract

As one of the green and healthy illumination sources, white organic light-emitting diodes (WOLEDs) have attracted substantial attention in the application of solid-state lighting owing to their promising features. Under conditions of color rendering index (CRI) higher than 80, it is still a major challenge for WOLEDs to simultaneously realize high efficiency, color stability and low efficiency roll-off. In this work, we successfully fabricated high-performance warm WOLEDs, showing not only high efficiency and low efficiency roll-off, but also high CRI and stable spectrum emission. The turn-on voltage is as low as 2.4 V, and the maximum forward-viewing external quantum efficiency, power efficiency and current efficiency reach 22.9%, 89.0 lm W−1 and 68.0 cd A−1, and still remain at 21.7%, 41.5 lm W−1 and 51.1 cd A−1 at 1000 cd m−2, respectively. Furthermore, the CRI is also over 80 with stable Commission International de I’Eclairage coordinates ranging from (0.448, 0.436) to (0.436, 0.421) as the luminance increases from 1000 to 10 000 cd m−2. In our design, the blue, yellow and red phosphors are doped in an exciplex host consisting of an electron-transporting material (ETM) and a hole-transporting material (HTM) by blending, and the blue/yellow/red sequence three-emissive-layer structure is constructed. It can be seen that the charge carrier transport balance and effective confinement of excitons within emissive layers are well-achieved by precisely manipulating the ratio between the HTM and ETM; therefore, the performance of the resulting WOLEDs has been improved comprehensively.

Graphical abstract: High efficiency warm white organic light-emitting diodes with precise confinement of charge carriers and excitons in the exciplex host system

Supplementary files

Article information


Submitted
08 Apr 2019
Accepted
14 May 2019
First published
16 May 2019

J. Mater. Chem. C, 2019,7, 7114-7120
Article type
Paper

High efficiency warm white organic light-emitting diodes with precise confinement of charge carriers and excitons in the exciplex host system

S. Ying, J. Yuan, S. Zhang, Q. Sun, Y. Dai, X. Qiao, D. Yang, J. Chen and D. Ma, J. Mater. Chem. C, 2019, 7, 7114 DOI: 10.1039/C9TC01892A

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.


Social activity

Search articles by author

Spotlight

Advertisements