Journal
JOURNAL OF MATERIALS CHEMISTRY C
Volume 3, Issue 36, Pages 9327-9336Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5tc01581b
Keywords
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Funding
- Cambridge Commonwealth
- European and International Trusts
- Rutherford Foundation of New Zealand
- Girton College Cambridge
- A*STAR National Science Scholarship (Republic of Singapore)
- Indo-UK APEX project
- ERC Advanced Investigator Grant
- Novox [ERC-2009-adG247276]
- EPSRC [EP/G060738/1]
- Cambridge Display Technology
- Royal Society
- EPSRC [EP/M005143/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/M005143/1, 1505389, EP/G060738/1] Funding Source: researchfish
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Hybrid blue polymer light emitting diodes (PLEDs) with high efficiencies, luminance >20 000 cd m(-2) and low operating voltages are obtained using processing temperatures <= 150 degrees C. By briefly applying an electric field across the device prior to measuring (pre-biasing), the PLEDs with unannealed Zn(1-x)MgxO/Cs2CO3 injectors have maximum luminances three times higher and operating voltages 26% lower than the previous state-of-the-art, which used ZnO cathodes processed at 400 degrees C. The high performance of our PLEDs is shown to be linked to the filling of trap states in the unannealed oxide cathode. Further reductions in the operating voltage are obtained through reductions in the electron-injection barrier by incorporating Mg into the ZnO cathode, as revealed by electroabsorption spectroscopy. Device characterization also shows that achieving efficient PLEDs requires the use of an interlayer (in our case Cs2CO3) to prevent non-radiative recombination at the cathode. The architecture and device processing methods we develop allow us to produce PLEDs with 80 nm thick emitters that have a turn-on voltage of only 3.7 V. This work takes a major step towards cheap, efficient flexible PLEDs for displays and lighting.
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