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Photoluminescence: Applications

Photoluminescence: Applications

Photoluminescence offers a wide range of applications due to its inherent sensitivity and selectivity. This technique allows for both direct and indirect analyses of the analyte. Direct quantitative analysis is possible when the analyte exhibits a favorable quantum yield for fluorescence or phosphorescence. However, an indirect analysis may be feasible if the analyte is not fluorescent or phosphorescent, or if the quantum yield is unfavorable. Indirect methods include reacting the analyte with...

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Updated: Nov 14, 2025

Enhanced Electron Injection and Exciton Confinement for Pure Blue Quantum-Dot Light-Emitting Diodes by Introducing Partially Oxidized Aluminum Cathode

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Performance of Spherical Quantum Well Down Converters in Solid State Lighting.

Iva Rreza¹, Haoran Yang², Leslie Hamachi^1,3

¹Department of Chemistry, Columbia University, New York, New York 10027, United States.

ACS Applied Materials & Interfaces

|March 8, 2021

Summary

Quantum dots (QDs) enhance solid-state lighting (SSL) performance. A ZnS shell optimizes QD stability and photoluminescence quantum yield (PLQY) for amber and red light emission in LED packages.

Keywords:

barrier layer down converters quantum dots quantum well solid state lighting

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Area of Science:

Materials Science
Optoelectronics
Nanotechnology

Background:

Solid-state lighting (SSL) relies on efficient light-emitting diodes (LEDs).
Quantum dots (QDs) offer tunable color conversion for enhanced LED performance.
Improving QD stability and efficiency in LED packages is crucial for long-term operation.

Purpose of the Study:

To evaluate the color conversion performance of amber and red emitting quantum dots (QDs) on InGaN SSL LED packages.
To investigate the impact of ZnS shell growth on QD stability and photoluminescence quantum yield (PLQY).
To optimize QD architectures for improved long-term operational stability in SSL applications.

Main Methods:

Synthesis of spherical quantum well (SQW) architectures (CdS/CdSe1-S/CdS) using thio- and selenourea reagents and high-throughput robotics.
Coating QDs with thick CdS shells to achieve high PLQY at amber and red emission wavelengths.
Encapsulating SQWs in silicone, depositing them on LED packages, and monitoring photoluminescence under accelerated aging conditions (85 °C, 5-85% RH, 3-45 W/cm²).

Main Results:

Achieved high PLQY (up to 88%) for amber and red emitting QDs (λmax = 600-642 nm, FWHM < 45 nm).
Demonstrated that a ZnS shell enhances QD stability during long-term operation on LED packages.
Observed reduced PLQY with increasing CdS shell thickness and the presence of a ZnS outer layer.

Conclusions:

The outer ZnS shell is critical for optimizing both PLQY and long-term operational stability of QDs in SSL packages.
Careful control over shell thickness and composition is necessary for balancing QD performance and durability.
This study provides insights into developing robust QD-enhanced SSL technologies.