Imperial College London
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Dr Robert Hoye, FIMMM CEng CSci

Faculty of Engineering, Department of Materials

Honorary Senior Lecturer
 
 
 
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Contact

 

+44 (0)20 7594 6048r.hoye Website

 
 
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Location

 

2.27Royal School of MinesSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Hoye:2019:10.1021/acsenergylett.9b00571,
author = {Hoye, RLZ and Lai, M-L and Anaya, M and Tong, Y and Gakowski, K and Doherty, T and Li, W and Huq, TN and Mackowski, S and Polavarapu, L and Feldmann, J and MacManus-Driscoll, JL and Friend, RH and Urban, AS and Stranks, SD},
doi = {10.1021/acsenergylett.9b00571},
journal = {ACS Energy Letters},
pages = {1181--1188},
title = {Identifying and reducing interfacial losses to enhance color-pure electroluminescence in blue-emitting perovskite nanoplatelet light-emitting diodes},
url = {http://dx.doi.org/10.1021/acsenergylett.9b00571},
volume = {4},
year = {2019}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - Perovskite nanoplatelets (NPls) hold promise for light-emitting applications, having achieved photoluminescence quantum efficiencies approaching unity in the blue wavelength range, where other metal-halide perovskites have typically been ineffective. However, the external quantum efficiencies (EQEs) of blue-emitting NPl light-emitting diodes (LEDs) have reached only 0.12%. In this work, we show that NPl LEDs are primarily limited by a poor electronic interface between the emitter and hole injector. We show that the NPls have remarkably deep ionization potentials (≥6.5 eV), leading to large barriers for hole injection, as well as substantial nonradiative decay at the NPl/hole-injector interface. We find that an effective way to reduce these nonradiative losses is by using poly(triarylamine) interlayers, which lead to an increase in the  EQE of the blue (464 nm emission wavelength) and sky-blue (489 nm emission wavelength) LEDs to 0.3% and 0.55%, respectively. Our work also identifies the key challenges for further efficiency increases.
AU  - Hoye,RLZ
AU  - Lai,M-L
AU  - Anaya,M
AU  - Tong,Y
AU  - Gakowski,K
AU  - Doherty,T
AU  - Li,W
AU  - Huq,TN
AU  - Mackowski,S
AU  - Polavarapu,L
AU  - Feldmann,J
AU  - MacManus-Driscoll,JL
AU  - Friend,RH
AU  - Urban,AS
AU  - Stranks,SD
DO  - 10.1021/acsenergylett.9b00571
EP  - 1188
PY  - 2019///
SN  - 2380-8195
SP  - 1181
TI  - Identifying and reducing interfacial losses to enhance color-pure electroluminescence in blue-emitting perovskite nanoplatelet light-emitting diodes
T2  - ACS Energy Letters
UR  - http://dx.doi.org/10.1021/acsenergylett.9b00571
UR  - https://pubs.acs.org/doi/10.1021/acsenergylett.9b00571
UR  - http://hdl.handle.net/10044/1/75986
VL  - 4
ER  -
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