CN107619663A

CN107619663A - A kind of green emitting phosphor of new rare-earth tungstate matrix

Info

Publication number: CN107619663A
Application number: CN201710740868.9A
Authority: CN
Inventors: 张正阳; 李金凯; 刘宗明
Original assignee: University of Jinan
Current assignee: University of Jinan
Priority date: 2017-08-25
Filing date: 2017-08-25
Publication date: 2018-01-23

Abstract

The present invention discloses a kind of green emitting phosphor of new rare-earth tungstate matrix, and the fluorescent material is prepared using rare earth oxide and tungstate dihydrate acid sodium as raw material using hydro-thermal method.Preparation-obtained fluorescence powder purity height, good crystallinity, good dispersion.Gained sample size is prepared with hydro-thermal method and reaches nanoscale, is easy to coating and application on device.The green emitting phosphor is with Gd₂WO₆For matrix Tb³⁺For activator, the spectrum of blue violet light LED transmittings, and Gd can effectively be absorbed by taking full advantage of tungstate radicle³⁺To Tb³⁺The advantages of energy transmission be present, to reach the purpose of enhancing green emission.

Description

A kind of green emitting phosphor of new rare-earth tungstate matrix

Technical field

The invention belongs to rare earth luminescent material field, and in particular to a kind of green fluorescence of new rare-earth tungstate matrix Powder.

Background technology

As the continuous renewal of embedded photoluminescent material and the traditional LED light source of development of LED technology can not meet people Growing demand.

Tungstates is a kind of typical self-activation material, can launch height under the exciting of the light source such as ultraviolet (UV), X ray The fluorescence of effect, and Gd³⁺It is a kind of good sensitizer again that host material, which can be done,；Therefore probed on the basis of traditional fluorescent material Dual sensibilization of the host material to activator ion is extremely important.

The content of the invention

It is contemplated that propose a kind of green of new rare-earth tungstate matrix for above-mentioned deficiency of the prior art Fluorescent material.

A kind of green emitting phosphor of new rare-earth tungstate matrix proposed by the present invention uses hydro-thermal method synthesis nano Gadolinium Tungstate（Gd₂WO₆：Tb³⁺）Green emitting body, the illuminator can produce Tb under 300nm burst of ultraviolel³⁺545nm or so Characteristic emission peak.

1. a kind of green emitting phosphor of new rare-earth tungstate matrix, it is characterised in that its preparation method includes following Step：

（1）By rare earth oxide（Gd₂O₃And Tb₄O₇）It is dissolved in hot nitric acid and is configured to 0.5mol/L rare earth nitrate solutions, measures 0.2mol rare earth nitrate solutions are added in 50ml deionized waters, and being stirred makes it well mixed；

（2）By RE：W=2：1 weighs 0.1mol Na₂WO₄·2H₂O white particles are dissolved in 20ml deionized waters, are stirred, and are made It is well mixed；

（3）By step（1）In the solution that stirs be added dropwise to step with pears type separatory funnel（2）It is to be titrated in resulting solution Continue stirring after end and carry out timeliness 30min processing, obtain mixed liquor；

（4）By step（3）In mixed liquor be added dropwise sodium hydroxide solution regulation arrive Ph=9, then move into reactor, be placed in 180 In DEG C electric dry oven after hydro-thermal reaction 24h, question response kettle is cooled to room temperature, takes out reactor and outwells supernatant, by bottom sediment from The heart, cleaning, obtain precursor powder after drying；

（5）By step（4）The precursor powder of middle gained obtains Gd after 1300 DEG C are calcined 3h in air atmosphere₂WO₆：Tb³⁺ Fluorescent material.

Brief description of the drawings

Fig. 1 is the X-ray diffractogram of the fluorescent material of the gained of embodiments of the invention 1.

Fig. 2 is the exciting light spectrogram of the fluorescent material of the gained of embodiments of the invention 1, and monitoring wavelength is 545nm.

Fig. 3 is the launching light spectrogram of the fluorescent material of the gained of embodiments of the invention 1, excitation wavelength 300nm.

Implement below by specific, the present invention is expanded on further.

Embodiment 1

Claims

1. a kind of green emitting phosphor of new rare-earth tungstate matrix, it is characterised in that its preparation method comprises the following steps：

（5）By step（4）The precursor powder of middle gained obtains Gd after 1300 DEG C are calcined 3h in air atmosphere₂WO₆：Tb³⁺It is glimmering Light powder.

2. a kind of green emitting phosphor of new rare-earth tungstate matrix, it is characterised in that its chemical formula, which forms, is Gd_1.8Tb_0.2WO₆。

3. a kind of green emitting phosphor of new rare-earth tungstate matrix, it is characterised in that it is calcined using once calcining It is made and does not have in Ar/H₂Reduced under atmosphere.

4. a kind of green emitting phosphor of new rare-earth tungstate matrix, it is characterised in that prepared using hydro-thermal method, gained fluorescence The good good crystallinity of powder uniformity, and be easy to coat and apply.

A kind of 5. green emitting phosphor of new rare-earth tungstate matrix, it is characterised in that Gd³⁺Transmitting and Tb³⁺Excite weight It is folded, be advantageous to the enhancing of green emission.

6. a kind of green emitting phosphor of new rare-earth tungstate matrix, it is characterised in that tungstate radicle can effectively absorb blue violet light The spectrum of LED transmittings is then passed to Tb³⁺, be advantageous to the enhancing of green emission.

7. a kind of green emitting phosphor of new rare-earth tungstate matrix, it is characterised in that tungstate radicle and Gd³⁺All it is both matrix material Material is again good sensitizer, all to Tb³⁺Transmitting has humidification.