Praseodymium doped borate red luminescent material and preparation method and applications thereof

A red luminescent, borate technology, applied in luminescent materials, chemical instruments and methods, sustainable manufacturing/processing, etc., can solve problems such as high control difficulty, fluorescence emission reabsorption, and reduced luminous efficiency, and achieve physical and chemical properties. Stable, high-efficiency red light luminous efficiency, stable physical and chemical properties

Active Publication Date: 2017-07-14
XIAMEN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The first is to realize white light emission through the combination of red, green and blue primary color LED chips. However, to realize LED white light output through this method needs to consider the driving characteristics of three different LED chips, which leads to complex circuit design of the light source.
The second is the integrated single-chip method, also known as the multi-quantum well method, which uses multiple active layers on a single chip to make the LED chip emit white light directly. The main defect of this method is the single-chip growth of multiple active layers. Complex technology and difficult control
The third method is the phosphor conversion method. There are two ways to achieve this method. One way is to excite the red, green and blue primary color phosphors through ultraviolet or near ultraviolet LEDs to achieve white light emission. There are also many such schemes. Defects are mainly reflected in: there is a significant difference in the aging degree of the three phosphors, resulting in a shift in the color coordinates of white light; at the same time, the phosphors of the three primary colors will absorb each other, especially the absorption of red light by blue-green phosphors, which will cause The luminous efficiency is significantly reduced; finally, the stability of the phosphor powder under ultraviolet light excitation is not good, resulting in low lumen efficiency of white LEDs
From these reports it can be found that although Pr 3+ Doped oxides can obtain red light output under the excitation of blue LEDs, but the luminous efficiency of praseodymium ions is not high. At the same time, due to the rich energy levels of praseodymium ions, there are problems such as reabsorption in the fluorescence emission between each energy level, so praseodymium ion doping Miscellaneous red luminescent materials are difficult to be widely used in white LEDs, and related research needs further exploration

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0024] Example 1: According to ARB 7 o 13 : Pr 3+ (A is one or a combination of Mg, Ca, Sr, Ba, Cu, Zn, etc.; R = one or a combination of Al, Sc, La, Gd, Y, Bi, etc.) The stoichiometric ratio is used for batching, and the raw material containing A is ACO 3 、ANO 3 or A(COOH) 2 One or more of them, the raw material containing R is R 2 o 3 , R 2 (NO 3 ) 3 or R 2 (CO 3 ) 3 One or more of them, Pr 3+ The raw material is Pr 6 o 11 or Pr 2 (CO 3 ) 3 One or more, H 3 BO 3 The stoichiometric excess of the raw materials is 3-20%, and the required raw materials are fully dried in an oven, and the corresponding raw materials are weighed according to the molar ratio in the molecular formula; the weighed raw materials are placed in an agate mortar for grinding, and the raw materials are Grind and mix evenly; then put the obtained mixture in a muffle furnace, and burn it for the first time at 200°C for 0.5-2 hours. After cooling, grind and pulverize the obtained material ...

example 2

[0025] Example 2: the raw material MgCO 3 、H 3 BO 3 、Al 2 o 3 and Pr 6 o 11 Place them in an oven at 200°C for more than 3 hours to remove moisture from the raw materials. Then the above raw materials were pressed by Pr 3+ MgAlB with a doping concentration of 4.0 at.% 7 o 13 The ratio of crystals requires weighing, where H 3 BO 3 According to the excess of 3-20% in the stoichiometric ratio, the prepared raw materials are fully mixed on the drum mixer, and then the oil pressure is 4 tons / cm 2 The pressure is pressed into a sheet of φ50mm. Put the thin slice in a furnace at 600-700°C for 5 hours at a constant temperature, then grind and press the sheet, put the thin skin in a furnace at 900-1500°C for sintering again, until the sintered material is identified by X-ray phase analysis. PR 3+ Doped MgAlB 7 o 13 Single crystal powder, the crystal belongs to the monoclinic system, and the unit cell parameters are α=γ=90°, β=91.51°.

[0026] Under the excitation of...

example 3

[0027] Example 3: Raw material MgCO 3 、H 3 BO 3 、Al 2 (CO 3 ) 3 、Pr 6 o 11 、HNO 3 Both NaOH and NaOH were purchased analytically pure samples without further purification. MgCO 3 、Al 2 (CO 3 ) 3 and Pr 6 o 11 Raw material by Pr 3+ MgAlB with a doping concentration of 4.0 at.% 7 o 13 The ratio of the crystals is required to be weighed, while the HNO 3 Heating, while dissolving the weighed raw materials into it, completely dissolving the excess HNO 3 Distilled off, and then the obtained product was dissolved in deionized water; press Pr 3+ MgAlB with a doping concentration of 4.0 at.% 7 o 13 Crystal weighed H 3 BO 3 , dissolved in deionized water while stirring, and then slowly added the solution to the previously obtained mixture, while adding an appropriate amount of HNO 3 or NaOH to adjust the pH value of the mixture to 7, and at the same time, stir the solution with a magnetic bar to obtain a solution containing a certain amount of precipitate; then po...

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Abstract

The invention discloses a praseodymium doped borate red luminescent material and a preparation method and applications thereof. The chemical formula of the luminescent material is ARB7O13:Pr3+; wherein A represents one or more of Mg, Ca, Sr, Ba, Cu, and Zn, and R represents one or more of Al, Sc, La, Gd, Y, and Bi. The properties and luminescent performance of the luminescent material are stable at a high temperature. The invention also discloses a preparation method of the praseodymium doped borate red luminescent material, the preparation technology is simple and is suitable for large scale industrial production, and the cost is low. The luminescent material can be applied to the fields such as white light LED illumination, display technology, and the like.

Description

technical field [0001] The invention relates to the technical fields of red luminescent material and white LED lighting and display, in particular to a class of praseodymium-doped borate red luminescent material and its preparation method and its application in white LED lighting and display technology. Background technique [0002] White LED is a new type of green solid-state lighting source with unlimited application potential. Compared with other energy-saving lamps and incandescent lamps, white LED has the advantages of low operating voltage, low power consumption, high reliability, long life, no pollution and high efficiency. The series of good characteristics are also the research focus of solid-state lighting sources. Phosphor powder is one of the main components in white LED solid-state lighting sources. The performance of phosphor powder determines key technical indicators such as LED luminous efficiency, color rendering index, color temperature and service life. T...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/63C09K11/64C09K11/78C09K11/80H01L33/50
CPCC09K11/7712C09K11/778H01L33/502Y02P20/10
Inventor 熊飞兵朱文章王逸平林海峰孟宪国
Owner XIAMEN UNIV OF TECH
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