The invention relates to an optoelectronic material comprising a compound, wherein the compound comprises: (i) one or more cations, A; (ii) one or more first B cations, B.sup.n+; (iii) one or more second B cations, B.sup.m+; and (iv) one or more chalcogen anions, X; wherein the one or more first B cations, B.sup.n+ are different from the one or more second B cations, B.sup.m+; n represents the oxidation state of the first B cation and is a positive integer of from 1 to 7 inclusive; m represents the oxidation state of the second B cation and is a positive integer of from 1 to 7 inclusive; and n+m is equal to 8.

A quantum dot color filter substrate includes a substrate, a color filter layer, a quantum dot film layer, and a transparent conductive layer disposed between the color filter layer and the quantum dot film layer. The transparent conductive layer is externally connected to a power module to form a closed circuit. When a voltage is applied to the transparent conductive layer, the transparent conductive layer may generate heat, which can quickly remove solvents in a quantum dot film layer.

A process for coating a phosphor of formula I: A.sub.x[MF.sub.y]:Mn.sup.4+ includes combining the phosphor of formula I in particulate form with a first solution including a compound of formula II: A.sub.x[MF.sub.y] to form a suspension and combining a second solution with the suspension, the second solution including a precursor including an element selected from the group consisting of calcium, strontium, magnesium, yittrium, barium, scandium, lanthanum, and combinations thereof. A population of particles having a core including a phosphor of formula I and a manganese-free composite coating disposed on the core, and a lighting apparatus (10) including the population of particles are also presented.

The present invention relates to Mn-activated luminescent materials, to a process for preparation thereof and to the use thereof as luminophores or conversion luminophores in light sources. The present invention further relates to a radiation-converting mixture comprising the luminescent material of the invention and a light source comprising the luminescent material of the invention or the radiation-converting mixture. The present invention further provides light sources, especially LEDs, and lighting units comprising a primary light source and the luminescent material of the invention or the radiation-converting mixture. The Mn-activated luminescent materials of the invention are especially suitable for creation of warm white light in LEDs.

A process for coating a phosphor of formula I: A.sub.x[MF.sub.y]:Mn.sup.4+ includes combining the phosphor of formula I in particulate form with a first solution including a compound of formula II: A.sub.x[MF.sub.y] to form a suspension and combining a second solution with the suspension, the second solution including a precursor including an element selected from the group consisting of calcium, strontium, magnesium, yittrium, barium, scandium, lanthanum, and combinations thereof. A population of particles having a core including a phosphor of formula I and a manganese-free composite coating disposed on the core, and a lighting apparatus (10) including the population of particles are also presented.

The present invention relates to Mn-activated luminescent materials, to a process for preparation thereof and to the use thereof as luminophores or conversion luminophores in light sources. The present invention further relates to a radiation-converting mixture comprising the luminescent material of the invention and a light source comprising the luminescent material of the invention or the radiation-converting mixture. The present invention further provides light sources, especially LEDs, and lighting units comprising a primary light source and the luminescent material of the invention or the radiation-converting mixture. The Mn-activated luminescent materials of the invention are especially suitable for creation of warm white light in LEDs.

A radiation sensing material is disclosed. The radiation sensing material is represented by the following formula (I):

(M1.sub.8-2aM2.sub.a)(M.sub.14-(4b/3)M.sub.b)O.sub.24(X.sub.2-dcdX.sub.n.sup.c?):M formula (I)

Further is disclosed a device and uses of the radiation sensing material represented by the formula (I).

A perovskite powder, a light emitting layer for a light emitting device, a perovskite layered structure, an optoelectronic device including the same, and a method for manufacturing the same are provided. The perovskite powder is easy to control the crystal phase ratio in the light emitting layer and is not pyrolyzed during deposition. In addition, the light emitting layer for the light emitting device has an enhanced exciton confinement effect to have excellent light emission efficiency and the like. In addition, the method for manufacturing the light emitting layer for the light emitting device may control the ratio of crystal phases in the light emitting layer and is advantageous for large-area manufacturing. In addition, the perovskite layered structure maintains very high phase uniformity. Further, the optoelectronic device has excellent performance. Furthermore, the method for manufacturing the perovskite layered structure may manufacture a large-area and uniform perovskite thin film.

A quantum dot color filter substrate includes a substrate, a color filter layer, a quantum dot film layer, and a transparent conductive layer disposed between the color filter layer and the quantum dot film layer. The transparent conductive layer is externally connected to a power module to form a closed circuit. When a voltage is applied to the transparent conductive layer, the transparent conductive layer may generate heat, which can quickly remove solvents in a quantum dot film layer.