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Updated: Jun 19, 2026

Patterning via Optical Saturable Transitions - Fabrication and Characterization

Patterning via Optical Saturable Transitions - Fabrication and Characterization

Published on: December 11, 2014

Polarization-based colour tuning of mixed colloidal quantum-dot thin films using direct patterning.

Eva De Leo¹, Aurelio A Rossinelli¹, Patricia Marqués-Gallego¹

¹Optical Materials Engineering Laboratory, ETH Zürich, Leonhardstrasse 21, Zürich 8092, Switzerland. ferry.prins@uam.es.

|March 22, 2022

Summary

Researchers developed a direct-patterning method for colloidal quantum-dot (cQD) films. This technique enhances light emission and enables active colour tuning through polarization control.

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Area of Science:

Optoelectronics
Photonics
Materials Science

Background:

Colloidal quantum dots (cQDs) offer high brightness and wide color gamuts for optoelectronic devices.
Current thin-film device efficiencies are limited by optical losses, particularly into waveguide modes.
Strategies to improve light outcoupling are crucial for advancing cQD-based technologies.

Purpose of the Study:

To enhance light outcoupling efficiency in colloidal quantum-dot (cQD) thin films.
To achieve bright, linearly polarized emission from cQD thin films.
To demonstrate active color tuning using polarization in cQD devices.

Main Methods:

Fabrication of linear gratings on cQD thin films using a template-stripping direct-patterning strategy.
Utilizing Bragg scattering from surface gratings to promote optical outcoupling.
Patterning gratings with varying periodicities and orientations on mixed-color cQD films.

Main Results:

Significant enhancement of optical outcoupling from cQD thin films.
Generation of bright emission with a high degree of linear polarization.
Demonstration of polarization-based active color tuning of the emitted light.

Conclusions:

Direct-patterning of linear gratings is an effective method to improve light outcoupling in cQD thin films.
The fabricated gratings enable efficient Bragg scattering, leading to polarized emission.
This approach provides a pathway for tunable color emission in advanced optoelectronic applications.