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Chlorine germanate upconversion fluorescent powder and preparation method therefor

A technology of chlorogermanate and phosphor, applied in the field of phosphor

Inactive Publication Date: 2015-09-23
OCEANS KING LIGHTING SCI&TECH CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are still few reports on the field of preparing phosphors and applying them to OLEDs.

Method used

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  • Chlorine germanate upconversion fluorescent powder and preparation method therefor

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Embodiment 1: take by weighing Li 2 CO 3 , GeO, Tm 2 o 3 , Yb 2 o 3 The powder, whose molar ratio is 2mmol, 2mmol, 0.03mmol, 0.01mmol, is dissolved in hydrochloric acid HCl to prepare a 1.5mol / L solution, and 0.01mol / L polyethylene glycol is added as a dispersant. Then the precursor solution is introduced into the atomizer of the spray dryer for spray drying. The inlet temperature was set at 180° C., the outlet temperature was set at 110° C., and 5 L / min of argon gas was fed into the atomizing device. The solution precursor starts to atomize into an aerosol, and enters the reaction system with the incoming gas, where the phosphor precursor is generated in the reaction system. Collect the precursor of phosphor powder, place it in a temperature-programmed furnace and calcinate for 3 hours at a calcining temperature of 1100°C to obtain Li 2 GeCl 6 : 0.03Tm 3+ , 0.01Yb 3+ Up-converting phosphors.

[0022] figure 1 It is the photoluminescence spectrogram of the c...

Embodiment 2

[0023] Embodiment 2: take by weighing Li 2 CO 3 , GeO, Tm 2 o 3 , Yb 2 o 3 The powder, the mole of which is 2mmol, 2mmol, 0.06mmol, 0.04mmol, is dissolved in hydrochloric acid HCl to prepare a 3mol / L solution, and 0.05mol / L polyethylene glycol is added as a dispersant. Then the precursor solution is introduced into the atomizer of the spray dryer for spray drying. The inlet temperature was set at 220° C., the outlet temperature was set at 130° C., and 15 L / min of argon gas was fed into the atomization device. The solution precursor starts to atomize into an aerosol, and enters the reaction system with the incoming gas, where the phosphor precursor is generated in the reaction system. Collect the precursor of phosphor powder, place it in a temperature-programmed furnace and calcinate for 5 hours at a calcining temperature of 1300°C to obtain Li 2 GeCl 6 : 0.06Tm 3+ , 0.04Yb 3+ Up-converting phosphors.

Embodiment 3

[0024] Embodiment 3: take by weighing Li 2 CO 3 , GeO, Tm 2 o 3 , Yb 2 o 3 The powder, whose mole is 2mmol, 2mmol, 0.002mmol, 0.002mmol, is dissolved in hydrochloric acid HCl to prepare a 0.5mol / L solution, and 0.005mol / L polyethylene glycol is added as a dispersant. Then the precursor solution is introduced into the atomizer of the spray dryer for spray drying. The inlet temperature was set to 150°C, the outlet temperature was set to 100°C, and 1 L / min of argon gas was fed into the atomization device. The solution precursor starts to atomize into an aerosol, and enters the reaction system with the incoming gas, where the phosphor precursor is generated in the reaction system. Collect the precursor of the phosphor powder, place it in a temperature-programmed furnace and calcinate it for 2 hours, and the calcining temperature is 600°C to obtain Li 2 GeCl 6 : 0.002Tm 3+ , 0.002Yb 3+ Up-converting phosphors.

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Abstract

The invention discloses chlorine germanate upconversion fluorescent powder and a preparation method therefor. The structural general formula of the fluorescent powder is R2GeCl6: xTm3+ and yYb3+, wherein the R2GeCl6 is a substrate, and the Tm3+ and the Yb3+ are activating elements which are used as luminous ion centers in films; the numerical value of x is 0.002-0.06, and the numerical value of y is 0.002-0.04. The thulium-ytterbium co-doping chlorogermanium acid upconversion fluorescent powder prepared by the preparation method disclosed by the invention can realize long-wave radiation excitation from infrared light to green light, and the obtained emission peaks of 454nm and 476nm respectively correspond to transition radiation emission of Tm3+ ions 1G4 to 3H6.

Description

technical field [0001] The invention relates to the field of fluorescent powder, in particular to a chlorogermanate up-conversion fluorescent powder and a preparation method thereof. Background technique [0002] The full name of OLED is Organic Light Emitting Diode, organic light emitting diode. It has many advantages. Its component structure is simple, its production cost is cheap, and its self-luminous characteristics, coupled with OLED's short response time and bendable characteristics, make it a very wide range of applications. However, it is difficult to obtain stable and efficient OLED blue light materials, which greatly limits the development of white light OLED devices and light source industries. [0003] Up-conversion fluorescent materials can emit visible light and even ultraviolet light under the excitation of long-wave (such as infrared) radiation, and have broad application prospects in the fields of optical fiber communication technology, fiber amplifier, th...

Claims

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Application Information

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IPC IPC(8): C09K11/66
Inventor 周明杰王平陈吉星张振华
Owner OCEANS KING LIGHTING SCI&TECH CO LTD