High-Reliability Perovskite Quantum Dots Using Atomic Layer Deposition Passivation for Novel Photonic Applications

Abstract

In this study, we propose highly stable perovskite quantum dots (PQDs) coated with Al2O3 using atomic layer deposition (ALD) passivation technology. This passivation layer effectively protects the QDs from moisture infiltration and oxidation as well as from high temperatures and any changes in the material characteristics. They exhibit excellent wavelength stability and reliability in terms of current variation tests, long-term light aging tests, and temperature/humidity tests (60°/90%). A white-light system has been fabricated by integrating a micro-LED and red phosphor exhibiting a high data transmission rate of 1 Gbit/s. These results suggest that PeQDs treated with ALD passivation protection offer promising prospects in full-color micro-displays and high-speed visible-light communication (VLC) applications.

InGaN-based Blue Resonant Cavity Micro-LED Combined with Red-Green-Yellow Quantum Dot Color Conversion Layer for Wide Color Gamut and Energy- Efficient Full-Color Displays

“…Past research has proven the effectiveness of using ALD passivation protection technology to coat QD surfaces with oxides. [13,14] This method effectively protects QDs from any changes due to high temperatures and material characteristics, as well as prevents moisture and oxidation. The developed full-color micro RCLED signi cantly improved light leakage and utilized RGBY four-color pixels, showcasing a full-color display with low energy consumption, high color purity, and a wide color gamut area.…”

“…Besides achieving higher color conversion e ciency, it also effectively enhances color purity, yielding a broader color gamut area, making it highly suitable as a color conversion layer (CCL). [12][13][14][15][16][17] Combining blue RCLED with red, green, and yellow CCLs achieves high directionality and precise wavelength control, helping to reduce optical crosstalk between different color pixels, thus enhancing color purity and display clarity.…”

InGaN blue resonant cavity micro-LED with RGY quantum dot layer for broad gamut, efficient displays

“…Additionally, it's noteworthy that a layer of Al 2 O 3 was applied on top of the QDPR CCL array using low-temperature ALD technology. Past research has proven the effectiveness of using ALD passivation protection technology to coat QD surfaces with oxides [ 13 , 14 ]. This method effectively protects QDs from any changes due to high temperatures and material characteristics, as well as prevents moisture and oxidation.…”

Ameliorating Uniformity and Color Conversion Efficiency in Quantum Dot-Based Micro-LED Displays through Blue–UV Hybrid Structures

“…Therefore, incorporating a passivation protection layer is crucial for CCLs [ 21 ]. Lee et al employed atomic layer deposition (ALD) passivation techniques to coat the QD surface with Al 2 O 3 , demonstrating impressive reliability in long-term aging and high temperature and humidity tests [ 22 ]. Similarly, Kuo et al leveraged low-temperature ALD technology to deposit Alumina (Al 2 O 3 ) on the QD film surface of the CCL, effectively obstructing water and oxygen and enhancing reliability [ 9 , 23 ].…”

“…Therefore, ensuring the effective dispersion of TiO 2 particles is a crucial factor for the performance of the color conversion layer. Furthermore, employing a distributed Bragg reflector (DBR) to reflect the excitation light source has become a prevalent method to enhance CCE [ 9 , 10 , 11 , 22 , 25 ]. Given that QDs exhibit a higher absorption of UV light, an alternate strategy could involve substituting blue µ-LED s with UV light to further enhance CCE.…”