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Zinc Phosphate Passivation Enables Photostable Pixelated Quantum Dot Color Conversion Layers for Display

Wei Ma^1,2, Liuqing Han^1,2, Yangyang Xie³

¹State Key Laboratory of Reliability and Intelligence of Electrical Equipment, Hebei University of Technology, Tianjin 300401, P. R. China.

The Journal of Physical Chemistry Letters

|September 9, 2025

Summary

We developed a new passivation method using zinc bis[2-(methacryloyloxy)ethyl] phosphate (Zn(BMEP)2) to protect quantum dots (QDs) from degradation. This enhances the stability and performance of QD-based micro-light-emitting diodes (LEDs) for displays.

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Area of Science:

Materials Science
Nanotechnology
Optoelectronics

Background:

Quantum dots (QDs) are promising for next-generation displays.
Photodegradation limits QD commercialization in micro-light-emitting diodes (LEDs).

Purpose of the Study:

To develop a passivation method for enhancing QD stability and performance in micro-LEDs.
To enable fabrication of stable QD photoresist (QDPR) micropatterns.

Main Methods:

Functional ligand zinc bis[2-(methacryloyloxy)ethyl] phosphate (Zn(BMEP)2) was used for QD surface passivation via a phosphine-mediated reaction.
QDPR micropatterns with 5 μm pixel sizes were fabricated.
Passivated QDs were tested for stability against air, heat, and UV light exposure.

Main Results:

Zn(BMEP)2 passivation improved QD solubility and stability in photoresists and solvents.
The -ZnBMEP passivation significantly enhanced QD efficiency and photostability.
Barrier-free QDPRs showed extended lifetime (L90 > 300 h) under accelerated photoaging, outperforming traditional QDPRs.

Conclusions:

The Zn(BMEP)2 passivation method offers remarkable protection against environmental stressors.
This approach advances the reliability and performance of QD-converted micro-LEDs.
It paves the way for high-performance, long-lasting display devices.