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Green perovskite quantum dot glass optical filter

A technology of quantum dot glass and perovskite, applied in optics, optical components, instruments, etc., can solve the problems of high production cost, low cut-off degree, high melting temperature, etc., and achieve long production cycle, large cut-off depth and low production temperature Effect

Active Publication Date: 2020-09-01
DALIAN MARITIME UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this filter is that the steepness of the transition area between transmission and cut-off is slightly lower, the cut-off degree is slightly lower, etc., and the melting temperature is too high (1380°C) and the time is long (several hours), resulting in high production costs and long production cycles.

Method used

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  • Green perovskite quantum dot glass optical filter
  • Green perovskite quantum dot glass optical filter
  • Green perovskite quantum dot glass optical filter

Examples

Experimental program
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Effect test

Embodiment 1

[0053] In this embodiment, a borate glass is used as the basic glass, and its chemical composition is as follows: 6Li 2 O-4Na 2 O-2K 2 O-10ZnO-15BaO-7SrO-0.3Sb 2 o 3 -55.7B 2 o 3 , the glass transition temperature of the borate glass is Tg=450°C, the crystallization initiation temperature Tx=624°C, and the crystallization temperature Tc=684°C. The temperature difference Tx-Tg=174°C is very large, which is the allowable heat treatment temperature range above Tg, such as Figure 6 As shown, the glass transition temperature Tg, crystallization onset temperature Tx and crystallization temperature Tc are 450°C, 624°C and 684°C, respectively. Perovskite quantum dots are CsPbBr 3 Structure, its crystal phase is cubic phase. Perovskite CsPbBr 3 The concentration of quantum dots is also very important, according to experiments, the effect of 2mol% concentration (molar concentration) is very good. For this basic glass and quantum dots, a concentration of 2 mol % is used in thi...

Embodiment 2

[0060] The green perovskite quantum dot glass filter of the present invention is different according to the application requirements, and the filter sometimes needs further processing to meet the performance requirements. For applications such as traffic lights, stage lights, flashlights, laser protection, medical treatment, and beauty, there is generally no need to further deal with the issue of luminescence, and its luminescence can also be used. For spectral filters, such as those on spectroscopic instruments and digital cameras, it is necessary to consider the influence of perovskite quantum dot luminescence. Perovskite quantum dots absorb short-wavelength light below the transmission limit wavelength, which will excite the quantum dots to emit light. Such as image 3 As shown, the luminescence wavelength of this kind of perovskite quantum dot glass is almost the same as the transmission limit wavelength, and it is necessary to coat a narrow-band reflective dielectric fil...

Embodiment 3

[0062] For some band-pass filtering applications, the long-wave cut-off region can be made by coating the long-wave cut-off dielectric film in the long-wavelength region of the pass-band back end of the perovskite quantum dot glass filter, and combined with the short-wave cut-off caused by quantum dots to form a band-pass filter light sheet, such as Figure 5 shown.

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Abstract

The invention provides a green perovskite quantum dot glass optical filter, which is prepared from base glass and perovskite quantum dots; and the perovskite quantum dots are used as a light absorption substance. A green perovskite quantum dot glass optical filter with the transmission boundary wavelength in a green light region is manufactured by utilizing the semiconductor absorption characteristic of perovskite quantum dots and the transparency of the base glass; the green perovskite quantum dot glass optical filter is a long-wave-pass filter, and has a finely adjustable transmission limitwavelength, a high passband transmittance, a wide passband width, a high cut-off band optical density, a wide cut-off band width, and a steep transmission-cut-off turning region. The perovskite quantum dot comprises a CsPbBr3 structure, a CsPb2Br5 structure and a Cs4PbBr6 structure, and can steeply absorb and cut off the wavelength of green light. The green perovskite quantum dot glass optical filter is wide in absorption spectrum range, large in absorption cut-off degree, large and flat in passband range, high in transmittance and steep in transmission-cut-off turning region; the manufacturing process is simple, the production temperature is low, time is short, the cost can be saved, and the production period is shortened.

Description

technical field [0001] The present invention relates to the technical field of colored optical glass filters, in particular to a green perovskite quantum dot glass filter, which is a kind of perovskite quantum dot glass whose transmission threshold wavelength of the absorbing substance is in the green Light zone filters. Background technique [0002] At present, the colored optical glass filter is an optical glass that selectively absorbs or transmits light of certain colors (wavelengths) on the spectrum, also known as filter glass. Colored optical glass is to add some raw materials (colorants) that can color the glass to the composition of colorless glass. The prior art mainly includes optical filters of ionic colorants, metal colloid colorants and sulfur selenium compound colorants. [0003] 1. Ion colorant filter. Using the selective absorption characteristics of transition metal (Ti, V, Cr, Mn, Fe, Co, Ni, Cu, etc.) ions and rare earth (Ce, Pr, Nd, Ho, Sm, etc.) The ...

Claims

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Application Information

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IPC IPC(8): G02B5/22
CPCG02B5/22G02B5/226
Inventor 张希珍陈宝玖孙佳石
Owner DALIAN MARITIME UNIVERSITY