Borate fluorescent powder and preparing method thereof
AssigneeWuhan China Star Optoelectronics Semiconductor Display Technology Co., Ltd.
InventorYuan Gao
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Abstract
A borate fluorescent powder and a preparing method thereof are provided. The formula of the borate fluorescent powder is Ba2-nSrnLu5-x-y-m-zLmCexTbyEuzB5O17. L is one or any combination of the elements Gd, La, and Sc. Ranges of x, y, z, m, and n are respectively 0<x≤0.6, 0<y≤3, 0<z≤0.4, 0≤m≤1, and 0≤n≤0.5. The borate fluorescent powder provided has a stable crystalline phase, high luminous efficiency, and decent thermal stability, and can be applied to ultraviolet LEDs or near-ultraviolet LEDs to construct white LEDs.
Claims16
A method for preparing a borate fluorescent powder of a formula Ba2-nSrnLu5-x-y-m-zLmCexTbyEuzB5O17, wherein L is one or any combination of the elements Gd, La, and Sc;
- x, y, z, m, and n all are mole fractions;
- and ranges of x, y, z, m, and n respectively are 0.001<x≤0.3, 0.001<y≤2, 0.01<z≤0.3, 0≤m≤1, and 0≤n≤0.5, the method comprising steps of:
- a step S10 of weighing stoichiometric amounts of the required raw materials of A, B, C, D, E, F, G, H, I, and J, and then mixing and grinding the required raw materials to obtain a first mixture, wherein the raw material of A is a compound including Ba2+, the raw material of B is a compound including Ce3+, the raw material of C is a compound including Tb3+, the raw material of D is a compound including Eu3+, the raw material of E is a compound including B3+, the raw material of F is a compound of Sr2+, the raw material of G is a compound including La3+, the raw material of H is a compound including Gd3+, the raw material of I is a compound including Lu3+, and the raw material of J is a compound including Sc3+;
- a step S20 of performing a first heat treatment on the first mixture under a condition of reduction gas to obtain a second mixture;
- and
- a step S30 of performing a second heat treatment on the second mixture under the condition of reduction gas, and then cooling and grinding the second mixture to obtain the borate fluorescent powder of formula Ba2-nSrnLu5-x-y-m-zLmCexTbyEuzB5O17, wherein the reduction gas is carbon monoxide or hydrogen.
A borate fluorescent powder, having a formula of
- Ba2-nSrnLu5-x-y-m-zLmCexTbyEuzB5O17,
- wherein L is one or any combination of the elements of Gd, La, and Sc;
- x, y, z, m, and n are all mole fractions;
- and ranges of x, y, z, m, and n are respectively 0<x≤0.6, 0<y≤3, 0<z≤0.4, 0≤m≤1, and 0≤n≤0.5.
A method for preparing a borate fluorescent powder of a formula Ba2-nSrnLu5-x-y-m-zLmCexTbyEuzB5O17, wherein L is one or any combination of the elements of Gd, La, and Sc;
- x, y, z, m, and n all are mole fractions;
- and ranges of x, y, z, m, and n respectively are 0<x≤0.6, 0<y≤3, 0<z≤0.4, 0≤m≤1, and 0≤n≤0.5, the method comprising steps of:
- a step S10 of weighing stoichiometric amounts of the required raw materials of A, B, C, D, E, F, G, H, I, and J, and then mixing and grinding the required raw materials to obtain a first mixture, wherein the raw material of A is a compound including Ba2+, the raw material of B is a compound including Ce3+, the raw material of C is a compound including Tb3+, the raw material of D is a compound including Eu3+, the raw material of E is a compound including B3+, the raw material of F is a compound of Sr2+, the raw material of G is a compound including La3+, the raw material of H is a compound including Gd3+, the raw material of I is a compound including Lu3+, and the raw material of J is a compound including Sc3+;
- a step S20 of performing a first heat treatment on the first mixture under a condition of reduction gas to obtain a second mixture;
- and
- a step S30 of performing a second heat treatment on the second mixture under the condition of reduction gas, and then cooling and grinding the second mixture to obtain the borate fluorescent powder of formula Ba2-nSrnLu5-x-y-m-zLmCexTbyEuzB5O17.
Dependencies are inferred from the claim text.