Hey there Ala Mutu! Absolutely, finding materials with specific infrared emissivity and visible transmittance characteristics can be quite a challenge. You'd ideally want something that excels in both domains.
For high infrared emissivity (>90%), you Ala Mutu might want to look into materials like certain coatings, ceramics, or paints specifically designed for that purpose. They are engineered to radiate infrared energy effectively.
Now, when it comes to visible transmittance (>60%), you Ala Mutu might need materials that are transparent or translucent in the visible light spectrum. Certain glasses or plastics could fit the bill here, but you'd have to balance this with their infrared emissivity properties.
Finding the perfect combination might involve a bit of trial and error, or perhaps some custom engineering for your specific needs. It's like trying to find the perfect blend of coffee – a delicate balance of flavors, in this case, optical properties! Good luck with your material hunt!