High-performance narrowband fluorescent powder and preparation method thereof

A fluorescent powder, high-performance technology, applied in chemical instruments and methods, luminescent materials, electrical components, etc., can solve the problems of low external quantum efficiency and instability of red fluorescent powder, achieve low cost, improve moisture resistance, and excellent performance Effect

Active Publication Date: 2019-02-01

SUN YAT SEN UNIV

1 Cites 4 Cited by

AI-Extracted Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the defects or deficiencies of low external quantum efficiency and instability in high-tem...

Method used

The phosphor powder of embodiment 3 passivation is combined with β-SiAlON:Eu2+green powder and blue light chip to prepare the white light LED device of different light colors, one of them white light LED device electrolu...

Abstract

The invention relates to high-performance narrowband fluorescent powder and a preparation method thereof. The preparation method comprises: S1, dissolving hexafluoromanganate in an HF solution, addinga silicon-containing compound and a cesium-containing compound under stirring to obtain a mixture; S2, carrying out a co-precipitation reaction at a temperature of -40 to -10 DEGC to obtain a precipitate, carrying out centrifugation, washing, and drying to obtain a Cs2SiF6:Mn<4+> fluorescent powder initial product; and S3, adding the Cs2SiF6:Mn<4+> fluorescent powder initial product into an acidsolution, adding a reducing solution under stirring, stirring, carrying out centrifugation, washing, and drying to obtain the high-performance narrowband fluorescent powder. According to the present invention, the preparation method has advantages of low cost, simplicity, easy operation and excellent performance, and is suitable for large-scale industrial production; and the prepared high-performance narrowband fluorescent powder has advantages of high quantum efficiency and good moisture resistance.

Application Domain

Luminescent compositionsSemiconductor devices

Technology Topic

NarrowbandPrecipitation +6

Image

Examples

Experimental program(5)
Effect test(1)

Example Embodiment

[0040] Embodiment 1~4

[0041] This example provides Cs 2 SiF 6 : Mn 4+ The phosphor is prepared by the following preparation method.

[0042] (1) K 2 MnF 6 preparation

[0043] K was prepared according to the method described in Angew. Chem-Ger. Edit. 65, 304-304 (1953) 2 MnF 6 crystal.

[0044] Put 0.45 g KMnO 4 and 9 g KHF 2 Dissolved in 30 ml of hydrofluoric acid (49%), stirred for 30 minutes, and then gradually added dropwise about 1.2 ml of hydrogen peroxide (30 wt.%), a yellow precipitate was gradually formed in the solution, and the solution was filtered to obtain the precipitate, and acetone was used to obtain the precipitate. After cleaning, bake at 80°C for 2 hours to obtain K 2 MnF 6.

[0045] Each embodiment starts with K 2 MnF 6 As the manganese source, other manganese sources, such as cesium hexafluoromanganate, also have the same effect.

[0046] (2) Cs before passivation 2 SiF 6 : Mn 4+ Preparation of phosphors

[0047] A certain amount of potassium hexafluoromanganate (K 2 MnF 6 ) was dissolved in 6.5 ml of HF (40 wt. %) solution; then, 0.93 ml of fluorosilicic acid (H 2 SiF 6 32 wt. %) and 0.8146 g of cesium carbonate (Cs 2 CO 3 ); transferred to a low-temperature constant temperature water bath, and stirred at -40 °C for 30 min to obtain a precipitate; finally, the obtained precipitate was centrifuged, washed with methanol, and dried at 50 °C for 2 h to obtain an orange phosphor.

[0048] (3) Cs after passivation 2 SiF 6 : Mn 4+ Preparation of phosphors

[0049] take Cs 2 SiF 6 :Mn 4+ The phosphor powder was added to 1 mL of acidic solution; a certain amount of reducing solution was added under stirring conditions, followed by stirring for 30 min; finally, the solid-liquid system was centrifuged, washed with methanol, and dried at 50 °C for 2 h to obtain the passivated phosphor powder .

[0050] In the embodiment 1~4, each condition is controlled as table 1:

[0051] Table 1 Cs 2 SiF 6 : Mn 4+ Phosphor Preparation Condition Control

[0052]

Example Embodiment

[0053] Embodiment 5~6

Example Embodiment

[0054] Example 5 is the same as Example 3 except that the selected silicon-containing compound is ethyl orthosilicate (0.5208 g). Prepared Cs 2 SiF 6 :Mn 4+ The properties of the phosphor are similar to those of Example 3.

PUM

Property	Measurement	Unit
Particle size	5.0 ~ 20.0	µm

Description & Claims & Application Information

We can also present the details of the Description, Claims and Application information to help users get a comprehensive understanding of the technical details of the patent, such as background art, summary of invention, brief description of drawings, description of embodiments, and other original content. On the other hand, users can also determine the specific scope of protection of the technology through the list of claims; as well as understand the changes in the life cycle of the technology with the presentation of the patent timeline. Login to view more.

Classification and recommendation of technical efficacy words

Improve moisture resistance
low cost

High-performance narrowband fluorescent powder and preparation method thereof

AI-Extracted Technical Summary

Problems solved by technology

Method used

Abstract

Image

Examples

Example Embodiment

Example Embodiment

Example Embodiment

PUM

Description & Claims & Application Information

Similar technology patents

Damp-proof warehouse for logistics

Pressure sensor for multi-way valve accelerated life test

One-time coloring premixing agent with mica powder wrapped by pearly-luster coating and manufacturing method

Moisture-proof device for water conservancy, hydropower and electrical automation equipment

Dampproof woven bag

Classification and recommendation of technical efficacy words

High flame-retardant and high flexibility epoxy resin composition and preparation method thereof

Moisture-proof cement hollow brick and preparation method thereof

Processing technology for motor winding

Damp-proof wood-plastic material for water meter shell

Multilayer ceramic capacitor

Method, apparatus and article for microfluidic control via electrowetting, for chemical, biochemical and biological assays and the like

System and method for transmitting wireless digital service signals via power transmission lines

System and method for determination of position

Adaptive antenna optimization network

Antenna device and method for attaching the same