Abstract
Relative emission spectra of LEDs depend on the junction temperature. The high-energy region of the emission spectrum can be modelled with the joint density of states and the Maxwell-Boltzmann distribution as a function of energy and junction temperature. It can be shown that the normalized emission spectra at different junction temperatures intersect at a unique energy value. Thus the wavelength and the relative intensity of the intersection point do not depend on the junction temperature of the LED. The invariant intersection energy exists for all LEDs manufactured using the elements from groups III-V. The wavelength determined by the intersection energy can be used as a temperature invariant wavelength and relative intensity reference in spectral measurements.
| Original language | English |
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| Article number | 012010 |
| Journal | Journal of Physics: Conference Series |
| Volume | 972 |
| Issue number | 1 |
| DOIs | |
| Publication status | Published - 2 Mar 2018 |
| MoE publication type | A4 Article in a conference publication |
| Event | 13th International Conference on New Developments and Applications in Optical Radiometry, NEWRAD 2017 - Tokyo, Japan Duration: 13 Jun 2017 → 16 Jun 2017 |
Funding
The work leading to this study was funded by the European Metrology Research Programme (EMRP) projects "Metrology for III-V materials based high efficiency multi-junction solar cells" and "Towards an energy-based parameter for photovoltaic classification." The EMRP is jointly funded by the participating countries within European Association of National Metrology Institutes (EURAMET) and the European Union.