Doping of nanoparticles from transition metal compounds with rare-earth metal ions, such as Eu3+ affords nanophosphors which feature upconversion (anti-Stokes) photoluminescence (uc-NP). Homogeneous dispersion and chemical immobilization of uc-NP in a suitable transparent matrix allows to generate adressable «active elements» transparent in off state but either opaque or luminous in on state. Switching between these two states can be accomplished by pulsed IR laser light. The emission of photons from selectively activated ensembles of uc-NPs having different PL characteristics can be employed to create visual representations of any object in three physical dimensions as opposed to planar images of traditional screens, thus providing ultimate physiological depth cues. As the color gamut of uc-NPs is typically much greater than that of the common RGB standard, 3D color images of high brilliance can be obtained provided that a well-balanced mixture of uc-NPs capable of emitting in the whole range of the visible light is randomly dispersed within the transparent matrix. Following our previous works on transparent, monolithic aerogels from nematic liquid-crystalline, nanofibrillated carboxyl cellulose derivatives, their reinforcement by percolating networks of biocompatible polymers and covalent equipment with both semiconductor and carbon based quantum dots, this paper communicates the results of an ongoing study investigating approaches towards grafting of uc-NP onto the large internal surface of transparent, highly porous yet mechanically robust aerogels from nematic liquid-crystalline suspensions of nanofibrillated oxidatively modified cellulose.

First steps towards bio-based static true volumetric 3D displays: Transparent cellulose scaffolds equipped with photon upconverting rare earth metal doped nanophosphors (uc-NP)

253rd National Meeting (2017)

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