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A kind of perovskite lanthanide composite nanomaterial and its preparation method and application in broadband photodetector

A composite nanomaterial and perovskite technology, which is applied in the use of electric radiation detectors for photometry, photovoltaic power generation, electric solid state devices, etc. , protect the effect of effective transmission

Active Publication Date: 2021-11-02
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Lanthanide-doped upconversion nanomaterials (UCNPs) are an anti-Stoke process, which can convert low-energy near-infrared light into high-energy visible light, but its inherent strict energy level distinction makes it very limited in wavelength adjustment.

Method used

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  • A kind of perovskite lanthanide composite nanomaterial and its preparation method and application in broadband photodetector
  • A kind of perovskite lanthanide composite nanomaterial and its preparation method and application in broadband photodetector
  • A kind of perovskite lanthanide composite nanomaterial and its preparation method and application in broadband photodetector

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Perovskite lanthanide composite nanomaterials UCNPs@mSiO 2@MAPbBr 3 Preparation of:

[0032] Step 1: First, 0.276 mmol Y(CH 3 CO 2 ) 3 , 0.12 mmol Yb(CH 3 CO 2 ) 3 , 0.004 mmol Tm (CH 3 CO 2 ) 3 The rare earth salt mix was added to a 50 mL flask containing 3 mL of OA and 7 mL of ODE. The mixture was heated to 150 °C for 30 min. After cooling to room temperature, it will contain 2 mL of 0.5 M NaOH and 4 mL of 0.4 M NH 4 The methanol solution of F was added to the reaction solution, and the temperature was raised to 50 °C to continue the reaction for 30 min. The mixed solution was continued to be heated to 100 °C, and the solution was degassed for 10 min to remove excess methanol. Recharge N 2 The temperature was further heated to 290 °C under protection for 90 min. After stirring and cooling to room temperature, the final core nano product was dispersed in 4 ml of cyclohexane after several times of washing and centrifugation with ethanol and cyclohexane. ...

Embodiment 2

[0040] Nanoparticles excited by light sources with different wavelengths to achieve broadband spectroscopy

[0041] Step 1: MAX (X = Cl, Br or I) vacuum at 60℃ overnight, mix MAX with PbX 2 Mixed in DMF in the desired molar ratio and heated to 80°C. Second, the mixed solution was gradually added dropwise to the UCNPs@mSiO 2 In the powder, it can be fully infiltrated and stirred vigorously for 30 min. Finally, it was dried at 95 °C for 30 min to obtain a solid powder.

[0042] Step 2: Control MAX and PbX as shown in Step 1 according to the influence of different halogen elements and content differences on luminescence properties 2 At the molar ratio, we prepared 8 kinds of perovskite composites dissolved in cyclohexane according to a certain ratio. Among them, 1, 3, and 8 represent pure chlorine, pure bromine, and pure iodine, respectively. 2 represents a mixture of chlorine and bromine; 4, 5, 6, and 7 represent a mixture of bromine and iodine, where the less bromine conte...

Embodiment 3

[0047] Establishment of Linear Response Curves for Different Excitation Lights

[0048] Perovskite lanthanide composite nanomaterials, select UCNPs@mSiO 2 @MAPbBr 3 As a research object, the composites were excited with X-rays, ultraviolet light, and near-infrared light. At the same time, we chose 504 nm to test the response curve by changing the X-ray radiation dose, the excitation power of near-infrared light, and the photon power of ultraviolet light.

[0049] Image 6 Linear response curves for different excitation lights. Responds positively to light at 980 nm because NaYF 4 :Yb / Tm (30 / 1 mol%)@NaYF 4 It is a green emission, a three-photon process, and can transfer energy to MAPbBr through a lanthanide upconversion process under 980 nm excitation 3 . Meanwhile, UCNPs@mSiO 2 @MAPbBr 3 The composite nanomaterials also have broad linear responses to UV excitation with different photon powers, indicating their ability to detect UV light. Different doses of X-rays wer...

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Abstract

The invention discloses a perovskite lanthanide composite nanomaterial and its preparation method and its application in a wide-band photodetector. The metal halide perovskite and lanthanide upconversion composite nanomaterial synthesized by a solution method, lanthanum Doped up-conversion nanomaterials (UCNPs) are an anti-Stoke process, which can just convert low-energy near-infrared light into high-energy visible light, and can make up for the shortcomings of perovskite for broadband photodetection. The lanthanide up-conversion of the present invention In nanomaterial-doped perovskite composite nanomaterials, the surface of upconversion nanomaterials is coated with mesoporous silica, and perovskite is formed by in-situ crystallization on the surface of mesoporous silicon, which has stronger quantum confinement and higher stability. It can be designed as a nanosensor for detecting X-ray, ultraviolet-visible and near-infrared light. The composite nanomaterial has a wide range of linear responses to x-rays with different dose rates and UV / NIR with different power densities.

Description

technical field [0001] The invention belongs to the field of photoelectric detection, and in particular relates to a perovskite lanthanide composite nanomaterial, a preparation method thereof, and an application in a broadband photodetector. [0002] technical background [0003] In the past few decades, organic-inorganic hybrid perovskites (CH 3 NH 3 PbX 3 , X = Cl, Br, I) and all-inorganic lead-containing perovskites (CsPbX 3 , X = Cl, Br, I) nanocrystals have undergone rapid development and attracted the attention of many scholars. Lead-halide perovskite nanocrystalline materials have many characteristics: such as full-spectrum light modulation, narrow emission band, high photo-induced efficiency, special electronic and crystal properties, endow them with higher carrier mobility and longer current. sub-diffusion depth. In particular, full color tuning and emission make this material ideal for light-emitting diodes such as LEDs, lasers, and optical sensors. Photodetec...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01J1/42G01T1/24H01L51/42
CPCG01J1/42G01T1/24H10K30/10Y02E10/549
Inventor 杨黄浩谢莉莉洪中柱陈秋水
Owner FUZHOU UNIV
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