Related Experiment Video
Updated: Aug 6, 2026
07:09
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, Milano 20133, Italy.
ACS Applied Materials & Interfaces
|July 23, 2026
Summary
Optimizing interfacial layers in colloidal semiconductor nanocrystal light-emitting diodes (LEDs) is key. Specific hole-transporting and electron-injecting polymer combinations enhance device performance, reducing turn-on voltage and boosting efficiency.
Area of Science:
- Materials Science
- Nanoscience
- Optoelectronics
Background:
- Colloidal semiconductor nanocrystal-based light-emitting diodes (LEDs) are promising for advanced displays.
- Device performance relies heavily on interfacial layer design for efficient charge injection and transport.
- Energy level alignment between layers is crucial for optimal carrier dynamics.
Purpose of the Study:
- To investigate the combined effect of hole-transporting (HT) and electron-injecting (EI) polymers on all-solution-processed LED performance.
- To explore how varying polymer properties, including energy levels and mobility, impact device characteristics.
- To understand the role of the electron-injecting/metal interface, modified with phosphonate side chains.
Main Methods:
- Fabrication of multilayered LEDs using CdSe/CdZnS nanoplatelets as deep-red emitters.
- Combination of three commercial HT polymers with custom-designed EI polymers with tailored HOMO/LUMO levels.
- Tuning of the EI/metal interface using phosphonate-functionalized polymer side chains.
- Assessment of device performance under inert and ambient conditions without encapsulation.
Main Results:
- Specific pairings of HT and EI polymers significantly influenced LED performance parameters.
- Achieved a reduced turn-on voltage as low as 1.7 V with optimized polymer combinations.
- Enhanced external quantum efficiency up to 7% was observed depending on the selected interfacial layers.
- Device performance correlated with the electronic properties of the interfacial layers.
Conclusions:
- The choice and combination of interfacial polymers are critical for optimizing colloidal nanocrystal LED performance.
- Tailoring energy levels and charge transport properties of HT/EI polymers can significantly improve device efficiency and reduce operating voltage.
- This work demonstrates a viable strategy for developing high-performance, solution-processed nanocrystal-based LEDs.
