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Blue-white light conversion fluorescent powder on the basis of UV light excitation and preparation thereof

A phosphor and ultraviolet light technology, applied in luminescent materials, sustainable buildings, climate sustainability, etc., can solve the problems of reducing luminous efficiency, affecting color reproducibility, etc., and achieve good color rendering effect.

Active Publication Date: 2016-06-15
CENT SOUTH UNIV
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Problems solved by technology

[0003] However, in the prior art, Eu-doped molybdate is a red phosphor, which is generally only used for the combination of red-based phosphor and green, blue-based phosphor to emit white light, because the method of phosphor mixing has the problem of ratio control. Affects color reproduction; there is also a reabsorption problem between different phosphors, which will lead to a decrease in overall luminous efficiency

Method used

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  • Blue-white light conversion fluorescent powder on the basis of UV light excitation and preparation thereof
  • Blue-white light conversion fluorescent powder on the basis of UV light excitation and preparation thereof
  • Blue-white light conversion fluorescent powder on the basis of UV light excitation and preparation thereof

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Experimental program
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Embodiment

[0022] 1. Preparation of samples N1, N2, N3 and N4

[0023] by NaSr 1-x MoO 4 Cl:xEu stoichiometric ratio Weigh a certain amount of sodium carbonate (Na 2 CO 3 ), strontium carbonate (SrCO 3 ), ammonium molybdate tetrahydrate ((NH 4 ) 6 Mo 7 o 24 4H 2 O), ammonium chloride (NH 4 Cl) (all above are analytically pure) and a certain amount of europium oxide (Eu 2 o 3 ) (99.99%), the Eu contents were 0.02, 0.05, 0.1 and 0.15 respectively; corresponding to sample numbers N1, N2, N3 and N4 (the same below). To prevent NH 4 Cl decomposes and evaporates in the process of heating up, so take 10% more when weighing. Put the weighed raw materials in an agate mortar and grind them thoroughly for 1.5 hours to make them evenly mixed, then put the ground raw materials into a corundum crucible, bake them in a high-temperature resistance furnace at 900°C for 3 hours, and cool down to room temperature with the furnace to obtain the obtained product. Need materials.

[0024] 2. Sa...

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Abstract

A blue-white light conversion fluorescent powder on the basis of UV light excitation and preparation thereof. The fluorescent powder is a single-phase luminescent material and has the chemical formula of NaSr<1-x>MoO4Cl : xEu, wherein the fluorescent powder has two luminescent centers: Eu<2+> / Eu<3+>, x refers to mole number and 0.02 <= x <= 0.15. The single fluorescent powder can emit blue light and white light under excitation of UV lights in different wavelengths. The blue light and the white light both have excellent stability and luminescence characters.

Description

technical field [0001] The invention relates to the technical field of luminescent materials, in particular to a blue-white light conversion fluorescent powder and a preparation method thereof. Background technique [0002] Luminescent materials based on strontium molybdate doped with trivalent rare earth ions such as Eu, Dy, Er, Pr, and Sm have been widely studied, and a series of luminescent materials with different emission wavelengths and excellent properties have been obtained. Gong Hui and Yuan Taoli took Dy 3+ For the luminescent center of the phosphor, use a single Y 3+ or Gd 3+ As a cation, the Y 2 (MoO 4 ) 3 : Dy 3+ and Gd 2 (MoO 4 ) 3 : Dy 3+ The luminous properties of the white light LED phosphors with good luminous properties have been obtained. Li Linlin and others studied the preparation and luminescence characteristics of fluorescent materials with molybdate ions as anions, trivalent La, Gd, Y, Lu ions as cations and doped with Li, Na, K and other ...

Claims

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Application Information

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IPC IPC(8): C09K11/68
CPCC09K11/684Y02B20/00
Inventor 姜锋朱德生
Owner CENT SOUTH UNIV
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