What is upconversion luminescence?

What is upconversion luminescence?

Upconversion luminescence is an optical process that emits high-energy photons by absorbing two or more low-energy photons, which is caused by anti-Stokes luminescence, has attracted significant attention in recent years.

How do upconversion nanoparticles work?

Upconversion nanoparticles are a new generation of fluorophore, relying on both physical and chemical principles to convert photons from a lower energy state to a higher energy state.

What are upconversion fluorescence materials?

Upconversion is a non-linear optical phenomenon by which low energy photons stimulate the emission of higher energy ones. Applications of upconversion materials are wide and cover diverse areas such as bio-imaging, solar cells, optical thermometry, displays, and anti-counterfeiting technologies, among others.

What does upconversion mean?

To convert one set of values to a higher set of values. For example, HDTV sets upconvert broadcast TV (480i) and DVD content (480i or 480p) to the highest format the set supports (720p, 1080i or 1080p). A/V receivers also provide upconversion.

Why lanthanides are used for upconversion?

Upconversion photoluminescence is a nonlinear effect where multiple lower energy excitation photons produce higher energy emission photons. This fundamentally interesting process has many applications in biomedical imaging, light source and display technology, and solar energy harvesting.

Which is the most acceptable mechanism for upconversion?

ETU is by far the most efficient upconversion process in RE doped nanomaterials and it is independent of the pump power. In the process of ETU, two situations, resonant non-radiative transfer and phonon-assisted non-radiative transfer in two-ion-involved system, will be mainly discussed (Figure 3) [1].

What is 4K upconversion?

4K Upconversion Explained In essence, it’s taking a 1920×1080 signal and scaling it up to 3840×2160 resolution. It HAS to do this, but while that sounds easy, it’s not. You don’t just resize the content, you also have to make sure that you don’t mess things up in the process.

What does 4K upconversion mean?

4K upscaling is the process where the player enhances the original input resolution. For the process to function the input quality must be Full HD (1920×1080). The player will upscale the original resolution from 1920×1080 to 3840×2160. 4K native content means that the input resolution is already 3840×2160 (4K).

What’s the difference between 4K and native 4K?

4K native content means that the input resolution is already 3840×2160 (4K). Although both native and upscaled offer the same resolution, native 4K is better as the picture contains more detail. Using upscaling detail cannot be added.

Is upscaled 4K better than 1080p?

The 4k image is smoother and has more detail than the 1080p image. Look closely and you’ll see that the edges around objects in the 1080p picture are a bit more blurry, and text looks clearer on the 4k TV.

Can the human eye see 16K?

Beyond that, the human eye wouldn’t be able to perceive any more detail on their screen. There’ll be no great race to 16K or 32K. “That’s about 48 million pixels to fill the field of view,” Huddy explains. So it would take a card six times more powerful than a card capable of producing 4K graphics.

Do our eyes see in 8K?

The term 8K doesn’t really apply to how eyes work, but if we reduce the complex nature of sight down to this marketing buzzword then yes, the human eye can see in 8K and beyond. The reason for this hesitation is that eyes don’t see in pixels, or use resolutions – no optician has ever said you can only see in 720p.