4 results about "Bismuth doping" patented technology

This invention provides a method for protecting the surface of aluminum alloys, aluminum alloy workpieces, and their applications, relating to the fields of aluminum alloy surface modification and laser protection technology. The method includes: preparation of microstructures on the aluminum alloy surface, anodic oxidation growth array, electrochemical deposition of ultraviolet absorbing particles, and sealing treatment. The dual three-dimensional structure formed by the microstructure substrate and the anodic oxidation array increases the laser contact area and extends the laser reflection path. The bismuth-doped tin oxide composite absorbing particles achieve highly efficient absorption of ultraviolet laser light, with absorption rates exceeding 95%, and significant stray light suppression.

This invention belongs to the field of inorganic luminescent materials technology, and provides a highly thermally stable blue-green germanate phosphor, its preparation method, and its applications. The chemical composition formula of this blue-green germanate phosphor is: Ba 1.98 MgGe2O7:0.01Bi 3+ The preparation method includes: (1) weighing the raw material powder separately; (2) grinding and pouring it into an alumina crucible; (3) sintering the alumina crucible containing the mixture. This phosphor uses the traditional high-temperature solid-state method to synthesize a new bismuth-doped germanate phosphor matrix in an atmospheric pressure air atmosphere. Not only is the synthesis method simple, but the prepared sample has no overlap between the excitation spectrum and the emission spectrum under the premise of wide absorption in the ultraviolet region, which can effectively avoid the phenomenon of spectral reabsorption. It can supplement the missing blue-green light region in white LEDs and match well with existing commercial 365nm near-ultraviolet LED chips. It can solve the problem that most phosphor systems cannot maintain excellent luminescence performance in high-temperature environments above 200℃.