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Orange-red rear-earth phosphors and preparation method thereof

A rare earth phosphor, orange-red technology, applied in the field of orange-red rare earth phosphor and its preparation, can solve the problems of low luminous efficiency of red light, low absorption efficiency, no research on the thermal quenching temperature of the phosphor, etc., and achieve high luminous efficiency , good thermal stability

Inactive Publication Date: 2013-04-24
YUNNAN MINZU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to Eu 3+ The excitation is 4 f -4 f Transition, low absorption efficiency in the near ultraviolet region, resulting in low red light emission efficiency
In addition, none of them studied the thermal quenching temperature of the phosphor

Method used

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  • Orange-red rear-earth phosphors and preparation method thereof
  • Orange-red rear-earth phosphors and preparation method thereof
  • Orange-red rear-earth phosphors and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Weigh strontium carbonate (SrCO 3 ): 2.89 g (51.70%), calcium chloride (CaCl 2 ): 1.11 g (19.86%), aluminum hydroxide [Al(OH) 3 ]: 1.56 g (27.90 %), europium trioxide (Eu 2 o 3 ): 0.03 g (0.54 %), fully ground in an agate mortar and mixed evenly, pre-fired at 500°C for 4 hours, cooled to room temperature, taken out and ground again, reduced and sintered in a CO atmosphere at 1200°C for 4 hours, Grinding the obtained sintered product to 350-400 nm to obtain the final product.

[0019] The luminescent properties of this phosphor are as follows figure 1 As shown, it has a strong excitation broadband excitation in the near ultraviolet region, and the emission spectrum under the excitation of 400 nm light is shown as figure 1 As shown, the emission of the sample is dominated by the orange-red emission around 600 nm.

[0020] The emission spectra of this phosphor at different temperatures are as follows: figure 2 shown. As the temperature increases, the luminous in...

Embodiment 2

[0023] Weigh strontium carbonate: 2.89 g (41.40%), strontium chloride hexahydrate: 2.67 g (38.25%), aluminum hydroxide: 0.78 g (11.17%), boric acid 0.61 g (8.74%), europium trioxide: 0.03 g (0.44%), ground in an agate mortar and mixed evenly, pre-fired at 400°C for 6 hours, cooled to room temperature, taken out and ground again, reduced and sintered in a CO atmosphere at 1100°C for 7 hours, and the obtained sintered Grind to get the final product.

Embodiment 3

[0025] Weigh strontium carbonate: 2.91 g (45.75%), strontium fluoride: 0.63 g (9.90%), strontium bromide: 1.24 g (19.50%), aluminum hydroxide: 1.56 g (24.53%), europium trioxide: 0.02 g (0.32%), fully ground in an agate mortar and mixed evenly, pre-fired at 500 °C for 3 hours, cooled to room temperature, taken out and ground again, reduced and sintered in a CO atmosphere at 1000 °C for 8 hours, the obtained The sinter is ground to obtain the final product.

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Abstract

The invention relates to orange-red rear-earth phosphors and a preparation method thereof. The orange-red rear-earth phosphors are prepared from strontium carbonate, calcium chloride, strontium chloride hexahydrate, strontium fluoride, strontium bromide, aluminum hydroxide, boric acid and europium oxide serving as raw materials by adopting a high-temperature solid state method. The preparation method comprises the following steps of: uniformly mixing the raw materials according to proportions, pre-sintering for 3-6 hours at 400-500 DEG C, cooling to a room temperature, taking out the raw materials and uniformly grinding again, reducing and sintering at a CO atmosphere for 4-10 hours at 1000-1200 DEG C, and grinding fine obtained sinters to obtain final products. The orange-red rear-earth phosphors have high luminous efficiency, good stability and very high quenching temperature and are suitable for InGaN chips giving out ultraviolet lights with about 400nm wavelength.

Description

technical field [0001] The invention relates to an orange-red rare earth phosphor and a preparation method thereof, specifically, an orange-red rare earth phosphor suitable for high heat quenching temperature excited by near-ultraviolet light of about 400 nm and a preparation method thereof. The invention belongs to the field of preparation of rare earth materials. Background technique [0002] White-light-emitting diode (W-LED, white-light-emitting diode) solid-state lighting has many obvious advantages over traditional lighting technologies (such as incandescent lamps, fluorescent lamps, etc.), and has become a research hotspot. At present, white light LEDs mainly realize white light in two ways: one is the fluorescent conversion type, that is, a single LED chip and a phosphor are combined to emit light; the other method is to use a combination of red, green, and blue LED chips to emit light, that is, multi-chip White LEDs. [0003] Known commercial white LEDs are still ...

Claims

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Application Information

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IPC IPC(8): C09K11/64
Inventor 汪正良周美丽胡芬芬朱怡雯程萍郭俊明
Owner YUNNAN MINZU UNIV
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