Single-matrix color-temperature-adjustable perovskite white light fluorescent powder and preparation method thereof

Abstract

The invention discloses single-matrix color-temperature-adjustable perovskite white light fluorescent powder and a preparation method thereof, and belongs to the technical field of solid-state illumination. The general chemical formula of the perovskite white light fluorescent powder is M2ZrCl6: x% Bi, y% Te, 1 < = x < = 8, 0.5 < = y < = 1, and M is selected from Rb or Cs; x and y respectively represent molar percentage contents of Bi and Te doping. Blue light and yellow light emitting centers are respectively generated by introducing Bi and Te ions, and the blue light and the yellow light emitting centers are superposed to enable the emission wavelength to cover the whole visible spectrum, so that white light emission can be realized. The fluorescence performance can be regulated and controlled by changing the concentration of Bi and Te ions and / or changing the excitation wavelength. According to the white light fluorescent powder, the mixing proportion of blue light and yellow light can be changed by changing the concentration of doped ions, the excitation degree of the blue light and the yellow light can be changed by changing the excitation wavelength, and the color temperature of the white light can be flexibly regulated and controlled.

Description

Technical Field

[0001] The present invention relates to the field of solid-state lighting technology, and specifically to a single-matrix color temperature-adjustable perovskite white-light phosphor and a preparation method thereof. Background Art

[0002] Solid-state white light-emitting diodes (WLEDs) surpass traditional lighting technologies such as incandescent lamps and fluorescent lamps in multiple key performance indicators such as luminous efficiency and color quality, and by adjusting the ratio of different color phosphors, the performance of solid-state WLEDs can be precisely controlled, such as CIE color coordinates (CIE is the abbreviation of the International Illumination Commission), color rendering index (CRI) and correlated color temperature (CCT). Traditional WLED phosphors mostly rely on rare earth elements or quantum dots, facing problems such as high cost, limited resources and high energy consumption, which is not conducive to the green energy conservation advocated by the country. In addition, in the existing technology, the difference in thermal stability of different types of phosphors will cause different degradation rates, resulting in poor color stability. Therefore, by developing luminescent materials that can couple a single matrix with multiple luminescent centers, the complexity of physical mixing is avoided, the color matching process is simplified from the root, and it becomes an ideal choice for WLED phosphors.

[0003] An ideal single-component fluorescent material must have strong ultraviolet absorption, a wide emission spectrum covering the visible light band, high fluorescence quantum yield, good chemical and thermal stability, low cost, and flexible spectral control. Perovskite materials have excellent luminescence properties and a variety of preparation methods, especially vacancy-ordered double perovskite M 2 BX 6 (M=Cs, Rb;B=Zr, Hf, Sn, ;X=Cl, Br),which has been proven to be effective in doping ns 2 Structural ions such as Bi and Te produce broad-spectrum blue and yellow light. Such material combinations can in principle achieve efficient white light emission under ultraviolet light excitation. By precisely controlling the ratio of doped ions, not only can the performance of WLED be adjusted, but also the color temperature can be adjusted by changing the excitation wavelength, which greatly enhances the application flexibility and market competitiveness of the product. Therefore, perovskite white light phosphors with adjustable color temperature based on a single matrix are expected to replace traditional rare earth-based phosphors in the field of WLED lighting and display, providing a more economical and environmentally friendly white light color temperature control solution.

[0004] This patent proposes a new type of UV-excited white light phosphor based on perovskite material and its preparation method, aiming to achieve a color temperature-adjustable white light phosphor with simple preparation process, short production cycle, low production cost and high repeatability, to meet the demand of modern lighting and display technology for high-performance white light phosphors. Summary of the invention

[0005] The purpose of the present invention is to provide a single-matrix perovskite white-light phosphor with adjustable color temperature and a preparation method thereof in order to meet the requirements of accurate color temperature control of a new type of high-efficiency white-light phosphor. The white-light phosphor material prepared by the method of the present invention has the characteristics of wide emission peak, high emission efficiency, adjustable emission wavelength and adjustable color temperature, and has the advantages of simple preparation method, low production cost and short production cycle.

[0006] The present invention provides a single-matrix perovskite white light phosphor with adjustable color temperature, with Rb 2 CO 3 , Cs 2 CO 3 , RbCl, CsCl, Bi 2 O 3 , TeO 2 , ZrCl 4 As raw material, hydrochloric acid as solvent, isopropanol as detergent. Through a simple precipitation method, M 2 ZrCl 6 :x%Bi,y%Te (1≤x≤8, 0.5≤y≤1) white light phosphor, where M is Rb or Cs; x and y represent the molar percentage of Bi and Te doping, respectively. 2 ZrCl 6 The molar ratio of Bi and Te is 100:x:y.

[0007] The optimal excitation peaks of the perovskite white light phosphor are 250-260nm and 320-350nm, and the emission wavelength range covers 400-700nm. The color coordinates, color temperature and color rendering index of the perovskite white light phosphor can be changed by changing the doping ion ratio and / or changing the excitation wavelength.

[0008] (1) When M is Rb, x=5, y=1, the perovskite white light phosphor:

[0009] The best excitation peaks are 250nm and 350nm, and the emission wavelength range covers 400-700nm;

[0010] The color temperature under 250nm excitation is 7266K, the color coordinates are (0.28, 0.38), and the color rendering index is 62;

[0011] The color temperature under 350nm excitation is 10526K, the color coordinates are (0.26, 0.31), and the color rendering index is 72.48.

[0012] Preferably, under 250nm excitation, when M is Rb, when x=5, y=0.6-1, changing the doping ratio of Te in the perovskite white light phosphor can achieve a change in color temperature from 9919K to 7266K, a change in CIE coordinates from (0.25, 0.33) to (0.28, 0.38), and a change in CRI index from 65.81 to 62.

[0013] (2) When M is Cs, x=2, y=0.5, the perovskite white light phosphor:

[0014] The best excitation peaks are 260nm and 320nm, and the emission wavelength range covers 400-700nm;

[0015] The color temperature under 260nm excitation is 9167K, the color coordinates are (0.27, 0.33), and the color rendering index is 75.04;

[0016] The color temperature under 320nm excitation is 5933K, the color coordinates are (0.30, 0.37), and the color rendering index is 63.74.

[0017] The method for preparing the perovskite white light phosphor comprises the following steps:

[0018] Step 1: Place the carbonate or chloride of M in a sample bottle, add an appropriate amount of concentrated hydrochloric acid, and stir to obtain the corresponding clear solution A;

[0019] Step 2: zirconium tetrachloride (ZrCl 4 ) was placed in another sample bottle, an appropriate amount of concentrated hydrochloric acid was added, and the mixture was stirred to obtain the corresponding clear solution B;

[0020] Step 3: Weigh an appropriate amount of bismuth oxide (Bi 2 O 3 ) and tellurium oxide (TeO 2 ) is placed in another sample bottle, an appropriate amount of concentrated hydrochloric acid is added, and stirred to obtain the corresponding clear solution C;

[0021] Step 4: Add an appropriate amount of solution C to solution B, place bottle B in an oil bath, and stir to mix the reactants completely.

[0022] Step 5: Quickly inject an appropriate amount of solution A into solution B and stir rapidly to allow sufficient reaction. Stir for 5 minutes to complete the reaction and obtain a mixed solution.

[0023] Step 6: Place the mixed solution into a centrifuge tube and centrifuge it, wash the sample with isopropanol, collect the product, and dry it in an oven to obtain a perovskite white light phosphor.

[0024] Preferably, in the mixed solution of step five, the molar ratio of M, Bi and Te is 200:(1-8):(0.5-1).

[0025] Preferably, the temperature of the oil bath in step 4 is 85°C.

[0026] Preferably, in step six, the drying conditions in the oven are: 60° C., 6 hours.

[0027] Beneficial effects: (1) The present invention adopts a precipitation method to co-dope Bi and Te ions into M 2 ZrCl 6 The matrix material is prepared into a perovskite microcrystalline powder, in which the introduction of Bi and Te ions produces blue and yellow luminescence centers respectively, and the superposition of the two makes the emission wavelength cover the entire visible spectrum, thereby realizing white light emission. The optimal excitation peaks of the white light phosphor are around 250-260nm and 320-350nm, and the emission wavelength range covers 400-700nm. Its fluorescence performance can be adjusted by changing the concentration of Bi and Te ions and changing the excitation wavelength. (2) Compared with commercial phosphors that require high-temperature solid-phase reactions, the present invention has a simple preparation method, low equipment requirements, high repetition rate, short production cycle, and is suitable for industrial large-scale production. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 is Rb prepared in the embodiment of the present invention 2 ZrCl 6 : Excitation and emission spectra corresponding to 5% Bi phosphor.

[0029] Figure 2 is Rb prepared in the embodiment of the present invention 2 ZrCl 6 : Excitation and emission spectra corresponding to 1% Te phosphor.

[0030] Figure 3 is Rb prepared in the embodiment of the present invention 2 ZrCl 6 : Spectrum diagram corresponding to 5% Bi, 1% Te phosphor; where (a) is the excitation and emission spectra, (b) is the Gaussian peak of the emission spectrum under 250nm wavelength excitation, and (c) is the Gaussian peak of the emission spectrum under 350nm wavelength excitation.

[0031] Figure 4 is Rb prepared in the embodiment of the present invention 2 ZrCl 6 : Spectral diagram corresponding to 5%Bi, y%Te (y=0.6–1) phosphor; where (a) is the emission spectrum under excitation at a wavelength of 250nm, and (b) is the emission spectrum under excitation at a wavelength of 350nm.

[0032] Figure 5 is Cs prepared in the embodiment of the present invention 2 ZrCl6 :Emission spectrum corresponding to 2%Bi, 0.5%Te phosphor; wherein, (a) is the excitation and emission spectrum, (b) is the Gaussian peak of the emission spectrum under excitation at a wavelength of 260nm, and (c) is the Gaussian peak of the emission spectrum under excitation at a wavelength of 320nm. DETAILED DESCRIPTION

[0033] The technical solution of the present invention is described in detail below through embodiments, but the protection scope of the present invention is not limited to the embodiments.

[0034] Example 1: M 2 ZrCl 6 Preparation of x%Bi, y%Te (1≤x≤8, y=0) blue light phosphor

[0035] This embodiment provides M 2 ZrCl 6 : Preparation method of x%Bi, y%Te (1≤x≤8, y=0) blue light phosphor. 2 ZrCl 6 Taking 5% Bi as an example, the specific operation method is as follows:

[0036] Step 1: weigh 0.231 g (1 mmol) of rubidium carbonate (Rb 2 CO 3 ) was placed in a sample bottle, 2 mL of 37% pure concentrated hydrochloric acid was added, and the mixture was stirred to obtain the corresponding RbCl-HCl solution A.

[0037] Step 2: weigh 0.221 g (0.95 mmol) zirconium tetrachloride (ZrCl 4 ) was placed in another sample bottle, 1 mL of 37% concentrated hydrochloric acid was added, and the corresponding ZrCl 4 -HCl solution B.

[0038] Step 3: weigh 0.233 g (0.5 mmol) of bismuth oxide (Bi 2 O 3 ) was placed in another sample bottle, 1 mL of 37% concentrated hydrochloric acid was added, and the corresponding BiCl 3 -HCl solution C.

[0039] Step 4: Add 50 μL of solution C to solution B, place bottle B in an 85°C oil bath, and stir to mix the reactants completely.

[0040] Step 5: Quickly inject solution A into solution B and stir rapidly to allow for sufficient reaction. The reaction is completed after stirring for 5 minutes.

[0041] Step 6: After the reaction in step 5 is completed, the mixed solution is placed in a centrifuge tube and centrifuged, the sample is washed with isopropanol, the product is collected, and dried in an oven at 60° C. for 6 hours.

[0042] Step seven, grinding the powder sample to obtain phosphor.

[0043] After the above steps, Rb 2 ZrCl 6 :5% Bi perovskite blue phosphor. Figure 1 The Rb-based 2 ZrCl 6 : Excitation spectrum and emission spectrum of 5% Bi perovskite blue phosphor. The excitation wavelengths measured at emission wavelengths of 440nm and 450nm, and the emission wavelengths measured at excitation wavelengths of 260nm and 350nm. The excitation peak at 260nm and the emission peak at 440nm come from Rb 2 ZrCl 6 The excitation peak at 350nm and the emission peak at 450nm come from Bi doped ions. 2 ZrCl 6 :5% Bi perovskite blue phosphor has high luminescence intensity and has potential application in emitting blue light. It can be used in combination with commercial yellow phosphor or the yellow phase Rb 2 ZrCl 6 :Te combination achieves color tunability.

[0044] Example 2: M 2 ZrCl 6 Preparation of x%Bi, y%Te (x=0,0.5≤y≤1) yellow phosphor

[0045] This embodiment provides M 2 ZrCl 6 : Preparation method of x%Bi, y%Te (x=0,0.5≤y≤1) yellow phosphor. 2 ZrCl 6 Taking 1% Te as an example, the specific operation method is as follows:

[0046] Step 1: weigh 0.231 g (1 mmol) Rb 2 CO 3 Place in a sample bottle, add 2 mL of 37% pure concentrated hydrochloric acid, and stir to obtain the corresponding RbCl-HCl solution A.

[0047] Step 2: weigh 0.230 g (0.99 mmol) ZrCl 4 Place in another sample bottle, add 1mL of 37% concentrated hydrochloric acid, stir to obtain the corresponding ZrCl 4 -HCl solution B.

[0048] Step 3: weigh 0.160 g (1 mmol) TeO 2 Place in another sample bottle, add 1mL of 37% concentrated hydrochloric acid, stir to obtain the corresponding TeCl 4 -HCl solution C.

[0049] Step 4: Add 10 μL of solution C to solution B, place bottle B in an 85°C oil bath, and stir to mix the reactants completely.

[0050] Step 5: Quickly inject solution A into solution B and stir rapidly to allow for sufficient reaction. The reaction is completed after stirring for 5 minutes.

[0051] Step 6: After the reaction in step 5 is completed, the mixed solution is placed in a centrifuge tube and centrifuged, the sample is washed with isopropanol, the product is collected, and dried in an oven at 60° C. for 6 hours.

[0052] Step seven, grinding the powder sample to obtain phosphor.

[0053] After the above steps, Rb 2 ZrCl 6 :1%Te perovskite yellow phosphor. Figure 2 The Rb-based 2 ZrCl 6 : Excitation spectrum and emission spectrum of 1%Te perovskite yellow phosphor. The excitation wavelengths measured at emission wavelengths of 445nm and 550nm, and the emission wavelengths measured at excitation wavelengths of 250nm and 300nm. The excitation peak at 250nm and the emission peak at 445nm come from Rb 2 ZrCl 6 The excitation peaks at 300nm and 400nm and the emission peak at 550nm come from Te doped ions. 2 ZrCl 6 :1%Te perovskite yellow phosphor has high luminescence intensity and has potential application in emitting yellow light. It can be used in combination with commercial blue phosphor or the blue phase Rb 2 ZrCl 6 :Bi combination achieves color tunability.

[0054] Embodiment 3: M of the present invention 2 ZrCl 6 Preparation of x%Bi, y%Te (1≤x≤8, 0.5≤y≤1) white light phosphor

[0055] The M of the present invention 2 ZrCl 6:x%Bi,y%Te (1≤x≤8, 0.5≤y≤1) white light phosphor is based on the superposition of Bi doping to produce blue light and Te doping to produce yellow light. 2 ZrCl 6 : Taking 5%Bi, 1%Te as an example, the specific operation method is as follows:

[0056] Step 1: weigh 0.231 g (1 mmol) Rb 2 CO 3 Place in a sample bottle, add 2 mL of 37% pure concentrated hydrochloric acid, and stir to obtain the corresponding RbCl-HCl solution A.

[0057] Step 2: weigh 0.219 g (0.94 mmol) ZrCl 4 Place in another sample bottle, add 1mL of 37% concentrated hydrochloric acid, stir to obtain the corresponding ZrCl 4 -HCl solution B.

[0058] Step 3: weigh 0.233 g (0.5 mmol) Bi 2 O 3 and 0.160 g (1 mmol) TeO 2 Place them in two other sample bottles, add 1 mL of 37% concentrated hydrochloric acid, stir and obtain the corresponding BiCl 3 -HCl solution C and TeCl 4 -HCl solution D.

[0059] Step 4: Add 50 μL of solution C and 10 μL of solution D to solution B, place bottle B in an 85°C oil bath, and stir to mix the reactants completely.

[0060] Step 5: Quickly inject solution A into solution B and stir rapidly to allow for sufficient reaction. The reaction is completed after stirring for 5 minutes.

[0061] Step 6: After the reaction in step 5 is completed, the mixed solution is placed in a centrifuge tube and centrifuged, the sample is washed with isopropanol, the product is collected, and dried in an oven at 60° C. for 6 hours.

[0062] Step seven, grinding the powder sample to obtain phosphor.

[0063] After the above steps, Rb 2 ZrCl 6 :5%Bi, 1%Te perovskite white light phosphor. Figure 3 (a) shows the Rb-based 2 ZrCl 6: The excitation and emission spectra of 5% Bi, 1% Te perovskite white light phosphor, specifically, the excitation spectra measured at emission wavelengths of 445nm and 555nm, and the emission spectra measured at excitation wavelengths of 250nm, 305nm, 350nm and 390nm. The excitation peak at 250nm and the emission peak at 445nm come from Rb 2 ZrCl 6 The excitation peak at 350nm and the emission peak at 445nm come from Bi doped ions, and the excitation peaks at 305nm and 390nm and the emission peak at 555nm come from Te doped ions. Combined with the excitation spectrum, it can be seen that when the excitation wavelength is 250nm and 350nm, the intensity of the yellow light part and the blue light part are close, and white light can be formed. 2 ZrCl 6 :5%Bi, 1%Te perovskite white light phosphor has high luminous intensity and is an ideal single-matrix WLED phosphor.

[0064] The white powder Rb prepared in this embodiment 2 ZrCl 6 :5%Bi, 1%Te as an example, the white powder is excited with 250nm and 350nm excitation wavelengths respectively, and the corresponding emission wavelengths are measured as follows Figure 3 As shown in (b) and (c).

[0065] Figure 3 (b) is the Gaussian peak diagram of the emission spectrum of the white light phosphor under 250nm excitation. The Gaussian fitted emission spectrum is consistent with the measured data, indicating that the emission spectrum is a superposition of emission peaks centered at 445nm and 555nm, with half-maximum widths (FWHM) of 97nm and 112nm, respectively, from Bi and Te. According to calculations, the color temperature of the white light phosphor under 250nm excitation is 7266K, the color coordinates are (0.28, 0.38), and the color rendering index is 62.

[0066] Figure 3 (c) is the Gaussian peak diagram of the emission spectrum of the white light phosphor under 350nm excitation. The Gaussian fitted emission spectrum is consistent with the measured data, indicating that the emission spectrum is a superposition of emission peaks centered at 445nm and 555nm, and their FWHMs are 65nm and 118nm, respectively, from Bi and Te. According to calculations, the color temperature of the white light phosphor under 350nm excitation is 10526K, the color coordinates are (0.26, 0.31), and the color rendering index is 72.48.

[0067] The white light phosphor is mixed with epoxy resin AB glue, coated on a 250nm commercial LED chip, and assembled into a WLED to achieve white light illumination. Similarly, it can be coated on a 350nm commercial LED chip and assembled into a WLED to achieve white light illumination. The above examples show that the color temperature of white light can be adjusted by changing the excitation wavelength.

[0068] Figure 4 (a) is the white powder Rb 2 ZrCl 6 :Emission spectrum of 5%Bi, y%Te (y=0.6–1) under 250nm wavelength excitation, Figure 4 (b) is the white powder Rb 2 ZrCl 6 :Emission spectrum of 5%Bi, y%Te (y=0.6–1) under 350nm wavelength excitation. With the increase of Te ion concentration, the intensity of the blue light part gradually weakens, the intensity of the yellow light part gradually increases, and there is no obvious shift in the emission peak. When the doping ratio of Te changes, under 250nm wavelength excitation, the white powder can achieve a color temperature from 9919K to 7266K, CIE coordinates from (0.25, 0.33) to (0.28, 0.38), and CRI index from 65.81 to 62. Under 350nm wavelength excitation, the white powder can achieve a color temperature from 22889K to 10526K, CIE coordinates from (0.23, 0.26) to (0.26, 0.31), and CRI index from 66.08 to 72.48. The above examples show that the color temperature of white light can be adjusted by changing the doping ion concentration.

[0069] Embodiment 4: M of the present invention 2 ZrCl 6 Preparation of x%Bi, y%Te (1≤x≤8, 0.5≤y≤1) white light phosphor

[0070] The M of the present invention 2 ZrCl 6 :x%Bi,y%Te (1≤x≤8, 0.5≤y≤1) white light phosphor is based on the superposition of Bi doping to produce blue light and Te doping to produce yellow light. 2 ZrCl 6 Taking 2%Bi, 0.5%Te as an example, the specific operation method is as follows:

[0071] Step 1: weigh 0.33672 g (2 mmol) of cesium chloride (CsCl) and place it in a sample bottle, add 2 mL of 37% pure concentrated hydrochloric acid, and stir to obtain the corresponding CsCl-HCl solution A.

[0072] Step 2: weigh 0.227 g (0.975 mmol) ZrCl 4 Place in another sample bottle, add 1mL of 37% concentrated hydrochloric acid, stir to obtain the corresponding ZrCl 4 -HCl solution B.

[0073] Step 3: weigh 0.233 g (0.5 mmol) Bi 2 O 3 and 0.160 g (1 mmol) TeO 2 Place them in two other sample bottles, add 1 mL of 37% concentrated hydrochloric acid, stir and obtain the corresponding BiCl 3 -HCl solution C and TeCl 4 -HCl solution D.

[0074] Step 4: Add 20 μL of solution C and 5 μL of solution D to solution B, place bottle B in an 85°C oil bath, and stir to mix the reactants completely.

[0075] Step 5: Quickly inject solution A into solution B and stir rapidly to allow for sufficient reaction. The reaction is completed after stirring for 5 minutes.

[0076] Step 6: After the reaction in step 5 is completed, the mixed solution is placed in a centrifuge tube and centrifuged, the sample is washed with isopropanol, the product is collected, and dried in an oven at 60° C. for 6 hours.

[0077] Step seven, grinding the powder sample to obtain phosphor.

[0078] After the above steps, Cs 2 ZrCl 6 :2%Bi,0.5%Te perovskite white light phosphor. Figure 5 (a) is the Cs 2 ZrCl 6 : Fluorescence spectrum of 2% Bi, 0.5% Te perovskite white light phosphor, specifically, the excitation spectrum measured at emission wavelengths of 445nm and 555nm, and the emission spectrum measured at excitation wavelengths of 260nm and 320nm. 2 ZrCl 6 :5%Bi, 1%Te are similar. Combined with the excitation spectrum, it can be seen that when the excitation wavelength is 260nm and 320nm, the intensity of the yellow light part and the blue light part are close, and white light can be formed.

[0079] The white powder was excited with 260nm and 320nm excitation wavelengths, and the corresponding emission wavelengths were measured as follows: Figure 5 As shown in (b) and (c), they emit white light with different degrees of coolness and warmth respectively.

[0080] Figure 5 (b) is the Gaussian peak decomposition diagram of the emission spectrum of the white light phosphor under 260nm excitation. It can be seen that the simulated emission peak is close to the original emission peak. The emission peak can be split into emission peaks centered at 445nm and 555nm, and their half-maximum widths (FWHM) are 43nm and 148nm respectively, coming from different luminescence centers.

[0081] Figure 5 (c) is the Gaussian peak decomposition diagram of the emission spectrum of the white light phosphor under 320nm excitation. The Gaussian fitted emission spectrum is consistent with the measured data, indicating that the emission spectrum is a superposition of emission peaks centered at 445nm and 555nm, with a half-maximum width (FWHM) of 42nm and 120nm, respectively, from Bi and Te.

[0082] After calculation, the color temperature of the white light phosphor under 260nm excitation is 9167K, the color coordinates are (0.27, 0.33), and the color rendering index is 75.04. The color temperature of the white light phosphor under 320nm excitation is 5933K, the color coordinates are (0.30, 0.37), and the color rendering index is 63.74. The white light phosphor is mixed with epoxy resin AB glue, coated on a 320nm commercial LED chip, and assembled into a WLED to achieve white light illumination.

[0083] As described above, although the present invention has been shown and described with reference to specific preferred embodiments, it should not be construed as limiting the present invention itself. Various changes may be made to the form and details without departing from the spirit and scope of the present invention.

Claims

1. A single-matrix perovskite white-light phosphor with adjustable color temperature, characterized in that: The general chemical formula of the perovskite white light phosphor is: M2ZrCl6: x%Bi, y%Te, 1≤x≤8, 0.5≤y≤1, wherein M is Rb or Cs; x and y represent the molar percentage of Bi and Te doping, respectively.

2. The perovskite white light phosphor according to claim 1, characterized in that: The optimal excitation peaks of the perovskite white light phosphor are 250-260nm and 320-350nm, and the emission wavelength range covers 400-700nm.

3. The perovskite white light phosphor according to claim 1, characterized in that: The color coordinates, color temperature and color rendering index of the perovskite white light phosphor are changed by changing the doping ion ratio and / or changing the excitation wavelength.

4. The method for preparing the perovskite white light phosphor according to claim 1, characterized in that: The following steps are involved: Add the carbonate or chloride of M to concentrated hydrochloric acid and stir to obtain a clear solution A; Add zirconium tetrachloride to concentrated hydrochloric acid and stir to obtain a clear solution B; Add bismuth oxide and tellurium oxide to concentrated hydrochloric acid and stir to obtain the corresponding clear solution C; After adding solution C to solution B, place it in an oil bath and stir to completely mix the reactants. Then, inject solution A into solution B and stir to fully react to obtain a mixed solution. The mixed solution was centrifuged, washed with isopropanol, and the collected product was dried in an oven to obtain a perovskite white light phosphor.

5. The method for preparing the perovskite white light phosphor according to claim 4, characterized in that: The molar ratio of M, Bi and Te is 200:(1-8):(0.5-1).

6. The method for preparing the perovskite white light phosphor according to claim 4, characterized in that: The temperature of the oil bath was 85°C.

7. The method for preparing the perovskite white light phosphor according to claim 4, characterized in that: The drying conditions in the oven were: 60°C, 6 hours.

Images