Oxyfluoride glass-ceramics for upconversion all-optical combinational logic gate operations

Ultrahigh sensitivity upconversion low temperature sensorsviamanipulating the non-thermally coupled levels of Er3+ions

“…The emission intensity I UC and pumping power density P follow the formula log( I ) = n log( P ) + constant, where n is the number of UC photons required to fill the specific emission levels. 40,41 Excited via 980 nm laser at low or room temperature, the values n of blue emission are all close to 3, which illuminates that the blue emission process requires the absorbance of three photons (Fig. 3a–c).…”

C3-Symmetric Propeller-like Phenanthridine Derivative with Multiple Write-In Modes for Programmable Anti-Counterfeiting

“…Taking advantage of multiple write-in modes of PF-B and PF-N for information storage, a sequential logic gate combined with the “OR” logic gate for advanced anti-counterfeiting could be designed (Figure d). Specifically, the sequential logic gate requires multiple stimuli to be input in an exact sequence, rather than a simple combination of multiple stimuli as in the case of the “AND” and “OR” molecular logic gates (Figure b,c). − Accordingly, the output of sequential logic is determined by the present input and the sequence of past inputs corporately. Here, input signals of the sequential logic system are Al 3+ , Fe 2+ , and TFA, which can generate programmable outputs.…”

“…Second, reported SRCMs with multiple stimuli-responsive behaviors work in a combinational mode, i.e. , their outputs are a simple combination of the response of an individual stimulus. ,− Further, their reversibility to different stimuli is poorly engineered, and therefore, they are incompetent to construct sophistical logics and advanced anti-counterfeiting schemes. Third, conventional multiple stimuli-responsive molecules generally possess complex molecular structures, requiring tedious synthesis as well as a rigorous fabrication process, which further limit the practical application of SRCMs.…”

Dual-wavelength enhanced upconversion luminescence properties of Li+-doped NaYF4:Er,Yb glass-ceramic for all-optical logic operations

“…22,27–30 By matching different excitation wavelengths and changing the excitation power density can also induce electronic transition changes in the material; 31–34 for instance, dual-wavelength co-excitation can effectively improve the UC luminescence intensity. 35–38 Thus, a method of combining internal ions doped with dual-wavelength excitation could remarkably enhance UC luminescence. The excellent UC luminescence signal is suitable for the design of all-optical logic gates, where two laser sources were used as the input signals, and the UC emission information was used as the output signal.…”