Jump to main content
Jump to site search

Issue 2, 2018
Previous Article Next Article

Management of excitons for highly efficient organic light-emitting diodes with reduced triplet exciton quenching: synergistic effects of exciplex and quantum well structure

Author affiliations

Abstract

Non-doped architecture has achieved great success as a universal method for simplifying the structure of organic light-emitting diodes (OLEDs). Currently, great challenges remain in the quest to further enhance the efficiency and reduce the pronounced roll-off for ultrathin emitting layer (UEML) based devices. This paper proposes a new strategy by synergistically incorporating the so-called “interface-exciplex” (i-Exc) with a multi-quantum-well structure (MQW). In our green-emitting OLEDs, an extremely low voltage of ∼2.8 V at a current density (j) of 0.2 mA cm−2 is achieved, allowing the attainment of a maximum power efficiency (PE) of 92.8 lm W−1 with an external quantum efficiency (EQE) of 26.9%. More impressively, the population of triplet excitons is substantially reduced with the EQE just dropping by ∼5% from its maximum at a luminance (L) of 1000 cd m−2 for our 7-QW device. This compares favorably with a structurally similar device without the MQW whose EQE dropped as much as ∼31%. The nearly 6-fold enhancement in efficiency roll-off suggests that our findings could be a significant step towards realizing non-doped and low-cost OLED applications with outstanding performance at high luminances.

Graphical abstract: Management of excitons for highly efficient organic light-emitting diodes with reduced triplet exciton quenching: synergistic effects of exciplex and quantum well structure

Back to tab navigation

Supplementary files

Article information


Submitted
28 Sep 2017
Accepted
04 Dec 2017
First published
05 Dec 2017

J. Mater. Chem. C, 2018,6, 342-349
Article type
Paper

Management of excitons for highly efficient organic light-emitting diodes with reduced triplet exciton quenching: synergistic effects of exciplex and quantum well structure

S. Li, S. Wu, Y. Wang, J. Liang, Q. Sun, C. Huang, J. Wu, L. Liao and M. Fung, J. Mater. Chem. C, 2018, 6, 342
DOI: 10.1039/C7TC04441K

Social activity

Search articles by author

Spotlight

Advertisements