A mixed valence europium co-doped strontium magnesium lanthanum oxyapatite silicate luminescent material and its preparation method

Abstract

The invention discloses a mixed valence europium co-doped strontium magnesium lanthanum oxyapatite silicate luminescent material. The strontium magnesium lanthanum silicate is used as a phosphor matrix and europium ions are used as doping ions. The raw material is Strontium carbonate, magnesium carbonate, lanthanum oxide, silicic acid and europium oxide, while also adding flux boric acid and accelerator, the addition of boric acid is 2%-2.5% of the total mass of raw materials, and the addition of accelerator is 1.5% of the total mass, the luminescent material was prepared by a high-temperature solid-phase method, wherein the accelerator selected bis(triethanolamine) diisopropyl titanate, 2,5-difluorobenzyl zinc bromide, (3,4 ‑Epoxycyclohexyl)ethyltriethoxysilane, (4‑carboxybenzyl)methyldibenzyldicarbamate, bis(2,2,6,6,‑tetramethyl‑3,5 ‑Heptanedionate) calcium and tetrakis (ethylmethylamino) zirconium; the final luminescent material emits pure white light, the color rendering index can reach 90, and the color temperature is around 4000K, which can be used for indoor lighting.

Description

technical field [0001] The invention relates to a luminescent material, more specifically to a mixed valence europium co-doped strontium magnesium lanthanum oxyapatite silicate luminescent material and a preparation method thereof. Background technique [0002] Lamp is a great invention for human beings to conquer the night. Since Edison invented the incandescent lamp, you can see light everywhere even in the dark; It is also larger; with the advancement of science and technology, people have invented LEDs to replace incandescent lamps; LED is a diode that can emit light, and it is a solid-state semiconductor device that can convert electrical energy into visible light. It has long life and energy efficiency. High, small size, fast response, no pollution, energy saving and environmental protection, etc., are widely used in lighting, health care, national defense technology and other fields. [0003] Among them, the white light LED is mainly composed of two parts: the LED co...

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Problems solved by technology

[0002] Lamp is a great invention for human beings to conquer the night. Since Edison invented the incandescent lamp, you can see light everywhere even in the dark; It is also larger; with the advancement of science and technology, people have invented LEDs to replace incandescent lamps; LED is a diode that can emit light, and it is a solid-state semiconductor device that can convert electrical energy into visible light. It has long life and energy efficiency. High, small size, fast response, no pollution, energy saving and environmental protection, etc., widely used in lighting, health care, national defense technology and other fields

[0003] Among them, the white light LED is mainly composed of two parts: the LED core light-emitting chip and the phosphor powder that can be excited by the light emitted by the LED core light-emitting chip; The chips are coated with phosphors that can be effectively excited to compound white light. The simplest and most commonly used method is GaN-based blue LED chips with yellow phosphors; The color chip itself will change with temperature and driving voltage, resulting in too high color temperature, the color temperature is above 5000K, and the color temperature of indoor lighting generally needs to be around 4000K; because long-term use of LED light with high color temperature is easy to cause damage to the user's retina. Irreversible damage, so the luminescent material can only be used outdoors, not suitable for indoor lighting

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