Publication date: 10th April 2014
In the last few years, a passionate interest has been growing for controlling the electromagnetic radiation by focusing on patterned structures and materials, especially when the dimensions of the structured material match the wavelength for resonant optical processes. However, light distribution control can also be achieved using patterned structures at a micrometer level. A particularly interesting approach has been the control of light distribution spatially and spectrally generated by optically active trivalent lanthanide (Ln3+) ions. It has been demonstrated that by embedding Ln3+-doped nanoparticles into microstructured materials it might be possible to control the light spatially at the micrometer scale in a wide spectral range.This kind of technology might have interesting implications to reinforce an emerging technology as it is laser phosphor displays (LPD). These devices consist on a scanning laser beam that excites one or more luminescent materials deposition onto a screen which emit light to form images. The present technology consists on parallel stripes of phosphors deposited on a substrate, that emit light of different colors after absorbing the same laser wavelength. By generating a two-dimensional (2D) array of phosphors, intead of parallel strips, a better definition for the pixels on the screen could be envisaged. Also, present technology uses UV excitable phosphors that emit visible light. However, by using upconversion processes, powerful IR laser diodes at low prices can be used for the same purpose.Here we present the fabrication of upconversion laser phosphor displays based on 2D patterns fabricated on the surface of non-linear optical materials (KTiOPO4) by ultrafast laser ablation and consisting on an array of holes in which upconversion nanoparticles of monoclinic potassium double tungstates have been embedded able to emit blue, green and red light after excitation at 980 nm. The emissive properties of these displays have been analyzed.
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