Efficiency of true-green light emitting diodes: Non-uniformity and temperature effects

Ilya E. Titkov; Sergey Yu Karpov; Amit Yadav; Denis Mamedov; Vera L. Zerova; Edik Rafailov

doi:10.3390/ma10111323

Efficiency of true-green light emitting diodes: Non-uniformity and temperature effects

Ilya E. Titkov^*, Sergey Yu Karpov, Amit Yadav, Denis Mamedov, Vera L. Zerova, Edik Rafailov

^*Corresponding author for this work

Aston Institute of Photonic Technologies (AiPT)

Research output: Contribution to journal › Article › peer-review

Abstract

External quantum efficiency of industrial-grade green InGaN light-emitting diodes (LEDs) has been measured in a wide range of operating currents at various temperatures from 13 K to 300 K. Unlike blue LEDs, the efficiency as a function of current is found to have a multi-peak character, which could not be fitted by a simple ABC-model. This observation correlated with splitting of LED emission spectra into two peaks at certain currents. The characterization data are interpreted in terms of non-uniformity of the LED active region, which is tentatively attributed to extended defects like V-pits. We suggest a new approach to evaluation of temperature-dependent light extraction and internal quantum efficiencies taking into account the active region non-uniformity. As a result, the temperature dependence of light extraction and internal quantum efficiencies have been evaluated in the temperature range mentioned above and compared with those of blue LEDs.

Original language	English
Article number	1323
Journal	Materials
Volume	10
Issue number	11
Early online date	18 Nov 2017
DOIs	https://doi.org/10.3390/ma10111323
Publication status	Published - 18 Nov 2017

Bibliographical note

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

Keywords

Active region non-uniformity
Extended defects
InGaNgreen LEDs
Internal quantum efficiency
Light extraction efficiency
Modeling
Temperature-dependent electroluminescence

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10.3390/ma10111323Licence: CC BY 3.0

Efficiency of true-green light emitting diodes
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
Accepted author manuscript, 1.24 MB
Efficiency of True-Green Light Emitting Diodes: Non-Uniformity and Temperature Effects
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
Final published version, 2.31 MBLicence: CC BY 3.0

Cite this

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title = "Efficiency of true-green light emitting diodes: Non-uniformity and temperature effects",

abstract = "External quantum efficiency of industrial-grade green InGaN light-emitting diodes (LEDs) has been measured in a wide range of operating currents at various temperatures from 13 K to 300 K. Unlike blue LEDs, the efficiency as a function of current is found to have a multi-peak character, which could not be fitted by a simple ABC-model. This observation correlated with splitting of LED emission spectra into two peaks at certain currents. The characterization data are interpreted in terms of non-uniformity of the LED active region, which is tentatively attributed to extended defects like V-pits. We suggest a new approach to evaluation of temperature-dependent light extraction and internal quantum efficiencies taking into account the active region non-uniformity. As a result, the temperature dependence of light extraction and internal quantum efficiencies have been evaluated in the temperature range mentioned above and compared with those of blue LEDs.",

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AU - Titkov, Ilya E.

AU - Karpov, Sergey Yu

AU - Yadav, Amit

AU - Mamedov, Denis

AU - Zerova, Vera L.

AU - Rafailov, Edik

N1 - This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

PY - 2017/11/18

Y1 - 2017/11/18

N2 - External quantum efficiency of industrial-grade green InGaN light-emitting diodes (LEDs) has been measured in a wide range of operating currents at various temperatures from 13 K to 300 K. Unlike blue LEDs, the efficiency as a function of current is found to have a multi-peak character, which could not be fitted by a simple ABC-model. This observation correlated with splitting of LED emission spectra into two peaks at certain currents. The characterization data are interpreted in terms of non-uniformity of the LED active region, which is tentatively attributed to extended defects like V-pits. We suggest a new approach to evaluation of temperature-dependent light extraction and internal quantum efficiencies taking into account the active region non-uniformity. As a result, the temperature dependence of light extraction and internal quantum efficiencies have been evaluated in the temperature range mentioned above and compared with those of blue LEDs.

AB - External quantum efficiency of industrial-grade green InGaN light-emitting diodes (LEDs) has been measured in a wide range of operating currents at various temperatures from 13 K to 300 K. Unlike blue LEDs, the efficiency as a function of current is found to have a multi-peak character, which could not be fitted by a simple ABC-model. This observation correlated with splitting of LED emission spectra into two peaks at certain currents. The characterization data are interpreted in terms of non-uniformity of the LED active region, which is tentatively attributed to extended defects like V-pits. We suggest a new approach to evaluation of temperature-dependent light extraction and internal quantum efficiencies taking into account the active region non-uniformity. As a result, the temperature dependence of light extraction and internal quantum efficiencies have been evaluated in the temperature range mentioned above and compared with those of blue LEDs.

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Efficiency of true-green light emitting diodes: Non-uniformity and temperature effects

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Keywords

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