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The key innovation here is the IR-selective-reflection bulb coating. As such: >Fabrication of the VTIRF window >The quartz substrate with a size of 25 mm by 5
by scythe 4y ago
The key innovation here is the IR-selective-reflection bulb coating. As such:
>Fabrication of the VTIRF window
>The quartz substrate with a size of 25 mm by 50 mm is cleaned by bath ultrasonication using acetone, ethanol, and deionizing water for 10 min. The Al2O3 and HfO2 layers are deposited by atomic layer deposition (R200, PICOSUN) at 255°C using trimethylaluminum (Strem Chemicals) and tetrakis(dimethylamido)hafnium(IV) (Strem Chemicals) as precursors, respectively. The oxidizing agent is H2O. The precursor carrier gas is N2 (99.999% purity, Shanghai Weichuang Gas). The Ag-Ge alloy and SiO2 layers are deposited by electron beam evaporation (PVD 75, Kurt J. Lesker) in vacuum.
I'm no expert on how LEDs are made, but this coating certainly doesn't assemble itself.
- adrian_b 4y agoAll the layers are deposited successively on a larger glass panel using standard vapor deposition equipment, then the substrate is cut into the individual glass windows for the lamps. The article mentions explicitly all the equipment that has been used in the fabrication of the prototype. The fabrication of any semiconductor device, such as LEDs, includes many more such vapor deposition steps done in vacuum, using the same machines, but with much more stringent requirements for cleanliness and defect control. Any defects in the deposition steps for such a lamp window will just reduce the efficiency of some lamps by a small fraction of a percent, while during LED fabrication they would have made unusable LEDs that would have been dumped.
- db48x 4y agoVapor deposition isn’t all that hard. You can do it in your kitchen if you want: https://www.youtube.com/watch?v=XHQxghdj2ks https://www.youtube.com/watch?v=XHQxghdj2ks