Effects of interfaces and current spreading on the thermal transport of micro-LEDs for kA-per-square-cm current injection levels

Li, Chengcheng; Chen, Zhizhong; Jiao, Fei; Zhan, Jing; Chen, Yifan; Chen, Yiyong; Nie, Jingxin; Zhao, Tong-Yang; Kang, Xiaoning; Feng, Shiwei; Zhang, Guoyi; Shen, Bo

doi:10.1039/c9ra04174e

Cited by 4 publications

(1 citation statement)

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“…Researchers most often focus on investigating the effect of power supply on photometric and colorimetric parameters, the correct and objective determination of the colour of LED light [27][28][29][30]. They also analyse the reduction in a discomfort glare by LEDs [31][32][33][34][35], the temperature distributions [36][37][38], the system power supply [39,40] and many other aspects. Unfortunately, very few publications are devoted to luminance measurements.…”

Section: Introductionmentioning

confidence: 99%

The Photometric Test Distance in Luminance Measurement of Light-Emitting Diodes in Road Lighting

Czyżewski

2023

Energies

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Over the last few years, light-emitting diodes have completely dominated the lighting field. In road lighting, high-power LEDs have replaced traditional light sources. That is why various technical aspects of LEDs have been researched extensively worldwide. However, little research has been conducted in the area of luminance measurement. This paper reviews the methods for measuring the luminance of high-power LEDs. Particular attention is paid to the influence of the measurement distance on the measurement results. Next, the results of the tests using a modern image luminance measuring device (ILMD) for luminance measurements are presented. It is concluded that it is necessary to redefine the photometric test distance. The conducted research demonstrates that an incorrectly selected test distance can lead to the huge errors of several hundred per cent or more. In addition, the possible impact of the incorrect measurements on the design of road lighting installations is presented. It is shown that a road lighting installation can use over 300% more electrical energy compared to the installation based on the correct luminance measurements of single LEDs. In the final stage of the research, the definition of the photometric test distance for LED measurements using ILMD is proposed. The results of the research can also be useful for the luminance measurements of other types of LEDs.

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Section: Introductionmentioning

confidence: 99%

The Photometric Test Distance in Luminance Measurement of Light-Emitting Diodes in Road Lighting

Czyżewski

2023

Energies

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Comparison of Beyond 1 GHz C-Plane Freestanding and Sapphire-Substrate GaN-Based micro-LEDs for High-Speed Visible Light Communication

Shan

Wang

Zhu

et al. 2023

J. Lightwave Technol.

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Study on 3D thermal transport in micro-LEDs on GaN substrate at the level of kW/cm²

Chen

Feng

Zhang

et al. 2019

2019 16th China International Forum on Solid State Lighting &Amp; 2019 International Forum on Wide Bandgap Semiconductors China

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Effects of interfaces and current spreading on the thermal transport of micro-LEDs for kA-per-square-cm current injection levels

Abstract: The three-dimensional thermal characteristics of micro-light-emitting diodes (μLEDs) on GaN and sapphire substrates were studied with forward-voltage methods, thermal transient measurements, and infrared thermal imaging.

Cited by 4 publications

References 39 publications

The Photometric Test Distance in Luminance Measurement of Light-Emitting Diodes in Road Lighting

The Photometric Test Distance in Luminance Measurement of Light-Emitting Diodes in Road Lighting

Comparison of Beyond 1 GHz C-Plane Freestanding and Sapphire-Substrate GaN-Based micro-LEDs for High-Speed Visible Light Communication

Study on 3D thermal transport in micro-LEDs on GaN substrate at the level of kW/cm²

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Effects of interfaces and current spreading on the thermal transport of micro-LEDs for kA-per-square-cm current injection levels

Abstract: The three-dimensional thermal characteristics of micro-light-emitting diodes (μLEDs) on GaN and sapphire substrates were studied with forward-voltage methods, thermal transient measurements, and infrared thermal imaging.

Cited by 4 publications

References 39 publications

The Photometric Test Distance in Luminance Measurement of Light-Emitting Diodes in Road Lighting

The Photometric Test Distance in Luminance Measurement of Light-Emitting Diodes in Road Lighting

Comparison of Beyond 1 GHz C-Plane Freestanding and Sapphire-Substrate GaN-Based micro-LEDs for High-Speed Visible Light Communication

Study on 3D thermal transport in micro-LEDs on GaN substrate at the level of kW/cm2

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Study on 3D thermal transport in micro-LEDs on GaN substrate at the level of kW/cm²