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Updated: Aug 7, 2026
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Development of Efficient OLEDs from Solution Deposition
Published on: November 4, 2022
Controlling Both Anode and Cathode Interfacial Properties of Nanocrystal LEDs by Combining Solution-Processed
Benedetta Maria Squeo1, Francesco Carulli2, Roberto Sorrentino1
1Consiglio Nazionale delle Ricerche (CNR), Istituto di Scienze e Tecnologie Chimiche "Giulio Natta" (SCITEC), via A. Corti 12, Milano20133, Italy.
ACS Applied Materials & Interfaces
|August 5, 2026
Summary
Optimizing interfacial layers in colloidal semiconductor nanocrystal light-emitting diodes (LEDs) is key. Specific polymer pairings significantly reduce turn-on voltage and boost external quantum efficiency for advanced displays.
Area of Science:
- Materials Science
- Nanotechnology
- Optoelectronics
Background:
- Colloidal semiconductor nanocrystal-based light-emitting diodes (LEDs) are crucial for next-generation displays.
- Device performance relies heavily on interfacial layer design for efficient charge injection and transport.
- Optimizing energy level alignment between layers is essential for efficient charge carrier recombination.
Purpose of the Study:
- Investigate the combined effect of hole-transporting (HT) and electron-injecting (EI) polymers in all-solution-processed LEDs.
- Explore how different HT/EI polymer combinations and EI/metal interfaces impact device performance.
- Correlate electronic properties of interfacial layers with fabricated LED performance.
Main Methods:
- Fabricated multilayered LEDs using CdSe/CdZnS nanoplatelets as deep-red emitters.
- Employed three commercial HT polymers and custom-designed EI polymers with varied energy levels.
- Tuned the EI/metal interface using phosphonate-functionalized polymer side chains.
- Assessed device performance under inert and ambient conditions without encapsulation.
Main Results:
- Specific HT/EI polymer pairings significantly influenced LED performance parameters.
- Achieved reduced turn-on voltages as low as 1.7 V with optimized polymer combinations.
- Enhanced external quantum efficiency up to 7% was observed with specific interfacial layer designs.
- Device performance correlated with the electronic properties of the interfacial layers.
Conclusions:
- The choice and combination of HT and EI polymers critically impact LED performance.
- Careful engineering of interfacial layers, including the EI/metal interface, is vital for efficient colloidal nanocrystal LEDs.
- This study demonstrates a pathway towards high-performance, solution-processed deep-red LEDs.
