Low and high frequency noise in LEDs
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arXiv
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| Auteurs principaux: | , , |
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| Format: | Preprint |
| Publié: |
2025
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| _version_ | 1866911197709729792 |
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| author | Bohomolov, Danylo Ivanova, Vita Schwarz, Ulrich T. |
| author_facet | Bohomolov, Danylo Ivanova, Vita Schwarz, Ulrich T. |
| contents | LED degradation is usually associated with defects in the active region. Whereby the noise analysis can be a strong instrument to reveal them. The results of optical noise measurements for commercially available blue LED samples in a wide frequency range from kHz to MHz are reported. Noise spectra were decomposed into components according to the presented theoretical model which includes 1/f-type noise, generation-recombination noise, and white noise. The 1/f$^γ$-type noise was modeled as a superposition of generation-recombination noise components at defects with a continuous wide distribution of relaxation lifetimes. The coincidence of the experimental results with 1/f$^γ$ model for the low frequency range is proved and a fitting is made. We identified three noise components that are highly current-dependent. The corresponding model of temperature dependence for the low-frequency range was developed. At low currents, the model partially matched the experimental results in the temperature range from 100 K to 300 K at low frequencies. However, high-frequency measurements showed deviations from the expected Lorentzian behavior. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2510_06833 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Low and high frequency noise in LEDs Bohomolov, Danylo Ivanova, Vita Schwarz, Ulrich T. Applied Physics LED degradation is usually associated with defects in the active region. Whereby the noise analysis can be a strong instrument to reveal them. The results of optical noise measurements for commercially available blue LED samples in a wide frequency range from kHz to MHz are reported. Noise spectra were decomposed into components according to the presented theoretical model which includes 1/f-type noise, generation-recombination noise, and white noise. The 1/f$^γ$-type noise was modeled as a superposition of generation-recombination noise components at defects with a continuous wide distribution of relaxation lifetimes. The coincidence of the experimental results with 1/f$^γ$ model for the low frequency range is proved and a fitting is made. We identified three noise components that are highly current-dependent. The corresponding model of temperature dependence for the low-frequency range was developed. At low currents, the model partially matched the experimental results in the temperature range from 100 K to 300 K at low frequencies. However, high-frequency measurements showed deviations from the expected Lorentzian behavior. |
| title | Low and high frequency noise in LEDs |
| topic | Applied Physics |
| url | https://arxiv.org/abs/2510.06833 |