I am looking for inorganic materials which emit NIR in the range of 4 to 5 micron. Nanoprticles, nanorod?? How long would gold nanorod be to have plasmon band at such range?
Solid state lasers - but I don't think that this is your actual question. See: http://www.laserfocusworld.com/articles/print/volume-34/issue-11/world-news/opos-tune-solid-state-cw-lasers-from-3-to-5-microns.html
Here's another link: http://iopscience.iop.org/journal/0268-1242/labtalk/article/49420
I suspect a Google search would pick up more relevant references for your application - which is what?
Fe:ZnSe or some perovskite nanoparticles emit in your MIR-range.
Article 3.9-4.8 µm gain-switched lasing of Fe:ZnSe at room temperature
Article 840 mW continuous-wave Fe:ZnSe laser operating at 4140 nm
Article Laser-induced down-conversion and infrared phosphorescence e...
addon: for MIR plasmonic phenomena see useful attached review.
Article Review of mid-infrared plasmonic materials
By the way, NIR is usually considered to be the region from 700 nm to 2500 nm approximately, although there is debate over definitions. I'd be considering your region as mid-IR (or thermal IR). See: https://en.wikipedia.org/wiki/Infrared
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