A broadband white light long afterglow material and its preparation method

A long afterglow material, white light technology, applied in luminescent materials, chemical instruments and methods, sustainable architecture, etc., can solve the problem of no one or no long afterglow material found, and achieve the effect of increasing afterglow time

Active Publication Date: 2015-09-16
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are few studies on long-lasting materials doped with transition metal ions, mainly long-lasting materials doped with Cr, Ti, and Mn, and the luminescence peaks also show broadband characteristics, but so far, we have not found A material whose luminescence peak can cover the entire visible band, and we have not found a long afterglow material that can achieve long afterglow luminescence without doping rare earth elements or transition metal elements

Method used

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  • A broadband white light long afterglow material and its preparation method
  • A broadband white light long afterglow material and its preparation method
  • A broadband white light long afterglow material and its preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0034] According to the following composition: the base material is Zn Z Al Y Ge X o （Z+1.5Y+2X） ; Among them, X=2, Y=1, Z=4, no doping elements; Weigh zinc oxide, aluminum oxide, germanium oxide respectively, after grinding and mixing, pre-burn at 900°C for 3 hours, take out, and grind again , fired at 1300°C for 3 hours.

[0035] The fluorescence spectrum of the sample prepared in this embodiment is as follows: figure 1 As shown, the luminescence of 300nm-800nm ​​is emitted under the excitation of 280nm, and the luminescence peak is located at 500nm, and the fluorescence emission of 500nm corresponds to two excitation peaks in the range of 200nm-350nm, which are 260nm and 280nm respectively. figure 2 The long afterglow luminescence decay spectrum of the sample prepared in this example is shown, and the afterglow decay 3 hours after the excitation is stopped, and the exponential decay curve shows the trapping mechanism. image 3 The long afterglow excitation spectrum of...

Embodiment 2

[0037] According to the following composition: the base material is Zn Z Al Y Ge X o （Z+1.5Y+2X） ; Among them, X=2, Y=1, Z=4, the doping element is Ca; Ca 2+ The doping amount is 5mol%; zinc oxide, aluminum oxide, calcium oxide, and germanium oxide were weighed, ground and mixed, pre-fired at 900°C for 3 hours, taken out, ground again, and fired at 1300°C for 3 hours. Figure 4 It is a comparison chart of the long afterglow attenuation spectra of the sample prepared in Example 1 and the sample prepared in Example 2 of the present invention. It is found that after doping with alkaline earth metals, the afterglow performance of the sample is enhanced.

Embodiment 3

[0039] According to the following composition: the base material is Zn Z Al Y Ge X o （Z+1.5Y+2X） ; Among them, X=0.5, Y=1, Z=1, no doping elements; Weigh zinc oxide, aluminum oxide, germanium oxide respectively, after grinding and mixing, pre-burn at 800°C for 1 hour, take out, and grind again , fired at 1500°C for 5 hours. After testing its luminescence spectrum, the luminescence peak is located at 520nm, and the afterglow time is greater than 2h.

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Abstract

The invention discloses a wideband white-light long-afterglow material with a substrate material of AZBYCXO (Z+1.5Y+2X). A is Zn; B is Al or Ga; C is one selected from Si, Ge, and Sn; X is no smaller than 0.5 and no greater than 5; Y is no smaller than 1 and no greater than 3, Z is no smaller than 1 and no greater than 10; and Z / X=2 / 1. 0-20mol% of M is doped in the substrate material, wherein M is one or two selected from alkali metal and alkaline earth metal. The invention also provides a preparation method of the material. The long-afterglow luminescent material provided by the invention has a light emission range at 300-800nm and a light emission peak at 520nm. The material can be excited within a range of 200-350nm, and can emit 300-800nm wideband florescence with an emission peak at 520nm. The material has a characteristic of long afterglow with a time longer than 2h.

Description

technical field [0001] The invention relates to a long afterglow material emitting light from defects, in particular to a broadband white light long afterglow material and a preparation method thereof. Background technique [0002] Long afterglow luminescent materials have a wide range of uses. At present, they are mainly used for indicating lighting in dark environments, such as emergency passage lighting, fire signs and other weak lighting indicating equipment, which is energy-saving and environmentally friendly. Long afterglow luminescent materials can also be used in the field of optoelectronic information (high-energy particle and defect damage detectors, three-dimensional information storage, etc.) [0003] The emission colors of the current long-lasting materials cover almost the entire visible light range, from blue light to red light, and long-lasting materials of various substrates, such as sulfides, aluminates, silicates, etc., have been continuously proposed. Th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/66C09K11/64C09K11/62
CPCY02B20/181Y02B20/00
Inventor 李杨董国平邱建荣彭明营
Owner SOUTH CHINA UNIV OF TECH
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