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Thermoelectrically Pumped Light-Emitting Diodes Operating above Unity Efficiency

(2012) Parthiban Santhanam et al.   PHYSICAL REVIEW LETTERS

Low Voltage CO$_2$-Gas Sensor Based on III–V Mid-IR Immersion Lens Diode Optopairs: Where we Are and How Far we Can Go?

(2010) Galina Yu. Sotnikova et al.   IEEE SENSORS JOURNAL

Analysis of heterostructures for electroluminescent refrigeration and light emitting without heat generation

(2010) Shun-Tung Yen et al.   JOURNAL OF APPLIED PHYSICS

The challenge of unity wall plug efficiency: The effects of internal heating on the efficiency of light emitting diodes

(2010) Oskari Heikkilä et al.   JOURNAL OF APPLIED PHYSICS

Laser cooling of solids to cryogenic temperatures

(2010) Denis V. Seletskiy et al.   Nature Photonics

Ultimate limit and temperature dependency of light-emitting diode efficiency

(2009) Oskari Heikkilä et al.   JOURNAL OF APPLIED PHYSICS