Tiny carbon tubes beam out stronger light by stealing a boost from internal vibrations—a discovery that could revolutionize ...

Upconversion is a phenomenon in which low-energy photons are combined to produce a higher-energy photon. This process requires the successive absorption of two photons to emit a high-energy photon. As ...

Photon upconversion involves a series of non-linear optical processes where the sequential absorption of two or more photons leads to the emission of a single photon with energy greater than the sum ...

Table 2. Representative literature on in vitro cytotoxicty of upconversion nanoparticles. Bladder cancer cell lines (MB49-PSA)-Silica Internalization [54] Bladder cancer cell lines (MB49 ...