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Issue 2, 2018
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Management of excitons for highly efficient organic light-emitting diodes with reduced triplet exciton quenching: synergistic effects of exciplex and quantum well structure

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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

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Publication details

The article was received on 28 Sep 2017, accepted on 04 Dec 2017 and first published on 05 Dec 2017


Article type: Paper
DOI: 10.1039/C7TC04441K
Citation: J. Mater. Chem. C, 2018,6, 342-349
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    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

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