Temperature invariant energy value in LED spectra

Hans Baumgartner (Corresponding Author), Anna Vaskuri, Petri Kärhä, Erkki Ikonen

Research output: Contribution to journalArticleScientificpeer-review

7 Citations (Scopus)


Relative emission spectra of light-emitting diodes (LEDs) depend on the junction temperature. The high-energy region of the emission spectrum can be modelled with Maxwell-Boltzmann distribution as a function of energy and junction temperature. We show that according to the model and our experiments, the normalized emission spectra at different junction temperatures intersect at a unique energy value. The invariant intersection energy exists for many types of LEDs and can be used to determine the alloy composition of the material. Furthermore, the wavelength determined by the intersection energy can be used as a temperature invariant wavelength reference in spectral measurements.
Original languageEnglish
JournalApplied Physics Letters
Issue number23
Publication statusPublished - 2016
MoE publication typeA1 Journal article-refereed

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