An upconversion multicolor light-emitting polymer composite implements red, green, and blue colors at wavelengths in each specific region by mixing: an upconversion nanophosphor emitting light in red and blue colors at wavelengths in each specific region by absorbing the infrared light; an upconversion nanophosphor emitting light in green and blue colors at wavelengths in each specific region by absorbing the infrared light; and a polydimethylsiloxane (PDMS) polymer. Accordingly, a volumetric display with excellent color reproducibility may be realized with a simple manufacturing process.

Mixed halide scintillation materials of the general formula AB.sub.(1y)M.sub.yX.sub.wX.sub.(3w), where 0y1, 0.05w1, A may be an alkali metal, B may be an alkali earth metal, and X and X may be two different halogen atoms, and of the general formula A.sub.(1y)BM.sub.yX.sub.wX.sub.(3w), where 0y1, 0.05w1, A maybe an alkali metal, B may be an alkali earth metal, and X and X are two different halogen atoms. The scintillation materials of formula (1) include a divalent external activator, M, such as Eu.sup.2+ or Yb.sup.2+. The scintillation materials of formula (2) include a monovalent external activator, M, such as Tl.sup.+, Na.sup.+ and In.sup.+.

A device including an LED light source optically coupled to a phosphor material including a green-emitting phosphor selected from the group consisting of compositions (A1)-(A62) and combinations thereof.

Mixed halide scintillation materials of the general formula AB.sub.(1-y)M.sub.yX.sub.wX.sub.(3-w), where 0y1, 0.05w1, A may be an alkali metal, B may be an alkali earth metal, and X and X may be two different halogen atoms, and of the general formula A.sub.(1-y)BM.sub.yX.sub.wX.sub.(3-w), where 0y1, 0.05w1, A maybe an alkali metal, B may be an alkali earth metal, and X and X are two different halogen atoms. The scintillation materials of formula (1) include a divalent external activator, M, such as Eu.sup.2+ or Yb.sup.2+. The scintillation materials of formula (2) include a monovalent external activator, M, such as Tl.sup.+, Na.sup.+ and In.sup.+.

A method for stabilizing a quantum dot's emission spectrum, comprising: illuminating the quantum dot with an illumination fluence sufficient to effect a persistent reduction in blue-shift over time in the quantum dot's spectrum. A method, comprising discriminating between a first quantum dot and a second quantum dot on the basis of spectral stabilities of the first quantum dot and the second quantum dot. A method, comprising: illuminating a quantum dot with a first fluence so as to effect a first emission color from the quantum dot; and illuminating the quantum dot with a second fluence so as to effect a second emission color from the quantum dot, the first fluence and the second fluence differing in intensity. A spectrally-stabilized quantum dot, the spectrally-stabilized quantum dot exhibiting a spectral shift of less than about 2.5 meV over about 15 minutes of continuous operation.

Embodiments of composite scintillators which may include a scintillator material encapsulated in a plastic matrix material and their methods of use are described.

Provided is a method of manufacturing a mechanoluminescent fiber. The method includes the steps of: preparing an elastic fiber having a longitudinal groove on the surface thereof; forming a primer layer including a coupling agent on the elastic fiber; filling the groove of the elastic fiber with a mixture of a stress transfer substance and a stress luminescent substance; and forming a silicon adhesive layer on the elastic fiber of which the groove is filled with the mixture of a stress transfer substance and a stress luminescent substance. The silicon adhesive layer is 3-dimensionally bonded to the elastic fiber and the mixture of a stress transfer substance and a stress luminescent substance.

A wireless optogenetic device in proximity to a neural cell of a subject includes a body configured to hold light transducing materials arranged to up-convert electromagnetic radiation in infrared or near-infrared spectrum into light in the visible spectrum to affect activity of the neural cell. The body allows electromagnetic radiation in infrared or near-infrared to reach the light transducing materials. A radiation system includes a radiation probe for irradiating a wireless optogenetic device with electromagnetic radiation in infrared or near-infrared spectrum from a radiation source. The system further includes a movement mechanism for moving the radiation probe, a detector for detecting a location of the wireless optogenetic device, and a controller for controlling the movement mechanism based on the detected location of the wireless optogenetic device such that the radiation probe is arranged to irradiate the wireless optogenetic device at the detected location with the electromagnetic radiation.

Provided are a nanophosphor and a silica composite including the nanophosphor. The nanophosphor has a core/first shell/second shell structure or a core/first shell/second shell/third shell structure, wherein the core includes a Yb.sup.3+-doped fluoride-based nanoparticle, the first shell is an up-conversion shell including a Yb.sup.3+ and Tm.sup.3+-codoped fluoride-based crystalline composition, the second shell is a fluoride-based emission shell, and the third shell is an outermost crystalline shell.

The present invention relates to a nanocrystal having a core-shell structure, wherein the core comprises a core perovskite structure, and the shell comprises a shell perovskite structure and a compound comprising silicon and oxygen, wherein the shell per-ovskite structure is different from the core perovskite structure and comprises a low-dimensional perovskite structure that is doped 5 with a metal halide comprising a monovalent, divalent or trivalent metal ion. The present invention also relates to a process for preparing the nanocrystal, a substrate comprising the nanocrystal and the use of the nanocrystal.