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Some facts from history of mid-IR LEDs and their use in gas analysis

Mid-IR region: fingerprints of gases

Negative luminescence devices (NL devices)

Optically Pumped LEDs (OP LEDs)

Optically coupled LED-PD pairs

List of patents on diodes and analyzers.

Front Surface Illuminated photodiodes (FSI PDs)

Backside illuminated photodiodes (BSI PDs)

Immersion Lens construction for LEDs and PDs

Rare Earth (Gd) doping /gettering

Challenges in mid-IR LED dimensions

Immersion direct way for photons and applications (APPENDIX to "Challenges in mid-IR LED dimensions")

Monolithically integrated evanescent wave sensor