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Luminescence Lifetime Imaging of O2 with a Frequency-Domain-Based Camera System

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Published on: December 16, 2019

Luminescent light diffuser for diffuse lighting applications.

Amy Witzmann¹, Calum K Gordon¹, Jesse Howarth¹

¹School of Chemical and Physical Sciences, The MacDiarmid Institute for Advanced Materials and Nanotechnology, The Dodd-Walls Centre for Photonic and Quantum Technologies, Victoria University of Wellington, Wellington, New Zealand.

Luminescence : the Journal of Biological and Chemical Luminescence

|November 26, 2022

Summary

Researchers developed an inexpensive, spatially broad white light diffuser using luminescent dyes and a polymer matrix. This novel lighting solution enhances energy efficiency and color purity compared to traditional LEDs.

Keywords:

diffuser luminescence organic dyes polymer waveguide

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Area of Science:

Materials Science
Optoelectronics
Photonics

Background:

The lighting industry consumes significant energy, with current luminescent white lighting often being impure, inefficient, and point-sourced.
Developing spatially broad lighting fixtures is crucial for improving lighting quality and energy efficiency.

Purpose of the Study:

To engineer a luminescent light diffuser capable of producing spatially broad, pure white light from a planar waveguide.
To investigate the operational principles and optimize the efficiency of such a device.

Main Methods:

Dispersing three luminescent dyes (rhodamine 6G, fluorescein, 7-diethylamino-4-methylcoumarin) in a polymer matrix (polyvinyl alcohol or commercial paint) coated on a planar waveguide.
Utilizing a 385 nm Light-Emitting Diode (LED) to excite the luminescent dyes within the coating.
Incorporating scattering silica microparticles into the polymer matrix to enhance photon outcoupling efficiency.

Main Results:

Two prototypes were developed: a small-scale polyvinyl alcohol-based device and a larger, optimized commercial paint-based device.
A maximum photon outcoupling efficiency of 78% was achieved by doping with silica microparticles.
The device achieved a significant increase in emission area (over 300 times) compared to the input LED, while maintaining color purity.

Conclusions:

It is feasible to create cost-effective, spatially broad lighting sources with high color purity.
The developed luminescent light diffuser technology offers a promising alternative to conventional lighting, improving both efficiency and light quality.