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Method for preparing BCNO fluorescent powder by sintering precursors at low temperature

A technology of low-temperature sintering and precursors, applied in chemical instruments and methods, luminescent materials, nitrogen and non-metallic compounds, etc., can solve the problems that are not conducive to the batch production and industrial application of BCNO phosphors, the deviation of emission spectrum of tens of nanometers, and the environment Pollution and other problems, to achieve the effect of insensitivity to sintering time, simple equipment, simple and easy method

Active Publication Date: 2014-03-19
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, people generally use urea combustion method (sintering temperature is 700~900℃, sintering time is 30~120 minutes) to prepare BCNO phosphor. A difference of a few minutes in the sintering time can cause a deviation of tens of nanometers in the emission spectrum. At the same time, ammonia gas will be generated when the urea is heated, which will cause environmental pollution.
Therefore, the urea combustion method is not conducive to the mass production and industrial application of BCNO phosphors

Method used

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  • Method for preparing BCNO fluorescent powder by sintering precursors at low temperature
  • Method for preparing BCNO fluorescent powder by sintering precursors at low temperature
  • Method for preparing BCNO fluorescent powder by sintering precursors at low temperature

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Embodiment 1

[0021] Example 1: Preparing BCNO phosphors by sintering precursors at different temperatures at low temperatures.

[0022] Step 1: Add 30mL of formaldehyde solution with a mass percentage of 37% in the flask, and heat it to 65°C; then add 15.159g (0.12mol) of melamine, and stir while heating (electromagnetic low-speed stirring, the speed is 50-100 rpm Minutes, the following steps of the present invention and the stirring of other embodiments are the same) until the solution is clarified, and the solution temperature is maintained at 65°C;

[0023] Step 2: Slowly add 62.352g (0.6mol) of trimethyl borate into the solution, keep stirring the solution until it becomes clear, then add 1mL of triethanolamine to the solution to adjust the pH value of the solution to 8. The temperature of the solution was kept at 65°C, stirred for 4 hours, the solution was poured into a beaker, and the solution solidified after 1 hour to obtain the precursor of BCNO;

[0024] Step 3: Take out the pre...

Embodiment 2

[0026] Other steps are the same as in Example 1, except that the sintering temperature in step 3 is changed from 550 degrees to 600 degrees.

Embodiment 3

[0028] Other steps are the same as in Example 1, except that the sintering temperature in step 3 is changed from 550 degrees to 625 degrees.

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Abstract

The invention relates to a method for preparing the BCNO fluorescent powder by sintering precursors at low temperature. The method comprises the following steps: step 1, heating 37% formaldehyde solution to 60-67 DEG C, and then adding melamine to stir until the solution is clear; step 2, adding trimethyl borate into the solution which is obtained in step 1, adding triethanolamine to adjust the pH value of the solution to be between 8-10 after the solution is clear; and step 3, sintering the BCNO precursors at 550-750 DEG C for 20-30 hours, and then, carrying out air cooling to room temperature to grind, and thus obtaining the BCNO fluorescent powder. According to the method for preparing the BCNO fluorescent powder by sintering precursors at low temperature, use of urea is prevented, the emission spectrum of the fluorescent powder can be adjusted in a visible light range through the method of adjusting the sintering temperature, formaldehyde usage and trimethyl borate usage, the adopted equipment is simple and low in cost, and the method is simple and practicable and is easy for mass production.

Description

technical field [0001] The invention belongs to the technical field of functional materials, and more specifically relates to a method for preparing BCNO (boron carbon nitrogen oxygen) fluorescent powder by sintering a precursor at a low temperature. Background technique [0002] Most of the current phosphor materials are based on rare earth elements (Eu 2+ 、Ce 3+ etc.) to emit light as an activator, which is not only expensive, but also pollutes the environment. BCNO is a non-REE-doped luminescent phosphor, which has attracted widespread attention because it does not require REEs as activators. BCNO phosphor has low preparation temperature (700~900°C), no need for protective atmosphere sintering (that is, sintering in air), energy saving and environmental protection, wide excitation spectrum range (from ultraviolet to blue light), and adjustable emission spectrum (visible light range ) and many other advantages, it has broad application prospects in the fields of lightin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B21/082C09K11/65
Inventor 张兴华唐成春卢遵铭孟凡斌林靖徐学文胡龙
Owner HEBEI UNIV OF TECH