Jump to main content
Jump to site search
Access to RSC content Close the message box

Continue to access RSC content when you are not at your institution. Follow our step-by-step guide.


Issue 22, 2020
Previous Article Next Article

Highly efficient fluorescence/phosphorescence hybrid white organic light-emitting devices based on a bipolar blue emitter to precisely control charges and excitons

Author affiliations

Abstract

Hybrid white organic light-emitting diodes (WOLEDs) combining blue fluorophores and green/red (or yellow) phosphors are still preferred for OLED production applications due to their advantages of good stability and high efficiency. One major challenge is to have a suitable blue fluorophore material to fully utilize the electrically generated excitons for fluorophore and phosphor emitters. Here, we employed an efficient blue fluorophore (PBI-PPI-TPA) with a high triplet energy of 2.48 eV as the blue emitter as well as the host for phosphors, whereby a series of highly efficient hybrid WOLEDs were successfully achieved. The two-color (BO) WOLEDs exhibited a maximum forward-viewing EQE/PE of up to 23.6%/77.8 lm W−1, and retained 20.0%/49.5 lm W−1 at 1000 cd m−2, thus exhibiting high-efficiency and low-efficiency roll-off. Furthermore, three-color (BYR) hybrid WOLEDs were also fabricated by adopting blue-yellow-red cascade energy transfer to ensure that all the excitons could be effectively utilized for the white emission. The resulting devices achieved a peak EQE/PE of 21.5%/53.2 lm W−1, retained 17.2%/26.8 lm W−1 at 1000 cd m−2, and the color rendering index (CRI) was doubled with respect to the two-color WOLEDs, showing a good trade-off between the efficiency and CRI. All these results are among the best reported for hybrid WOLEDs.

Graphical abstract: Highly efficient fluorescence/phosphorescence hybrid white organic light-emitting devices based on a bipolar blue emitter to precisely control charges and excitons

Back to tab navigation

Supplementary files

Article information


Submitted
26 Mar 2020
Accepted
21 Apr 2020
First published
22 Apr 2020

J. Mater. Chem. C, 2020,8, 7543-7551
Article type
Paper

Highly efficient fluorescence/phosphorescence hybrid white organic light-emitting devices based on a bipolar blue emitter to precisely control charges and excitons

Y. Chen, J. Zhu, Y. Wu, J. Yao, D. Yang, X. Qiao, Y. Dai, Q. Tong and D. Ma, J. Mater. Chem. C, 2020, 8, 7543
DOI: 10.1039/D0TC01549K

Social activity

Search articles by author

Spotlight

Advertisements