Multilayer film based on real-time and precise color change under electric field control
A multi-layer film and electric field technology, applied in the field of color-changing materials, can solve the problems that the color change cannot be precisely controlled, and the color-changing photonic crystal cannot change color in real time, and achieve the effects of low reflectivity, fast response speed, and high reflectivity
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Embodiment 1
[0037] Such as figure 1 As shown, two BST target materials with different strontium-barium components are prepared so that their refractive indices are 2.4 and 2.19 when no electric field is applied, and then a layer of transparent electrode, called the bottom electrode, is grown on the silicon substrate. Grow another layer of low-refractive index BST film, which is alternately grown by magnetron sputtering or pulsed laser deposition, and then grow a layer of high-refractive index film, wherein the thickness of the low-refractive index film is 66.5nm and the thickness of the high-refractive index film is 60.45 nm. A total of 5 cycles are grown, and then the same transparent electrode is grown on the upper layer, which is called the top electrode. Wherein, the transparent electrode is made of indium tin oxide (ITO) material and grown by magnetron sputtering. The high refractive index film is made of barium-rich BST material, and the low refractive index film is made of stront...
Embodiment 2
[0039] Prepare two BST target materials with different components of strontium and barium, so that their refractive indices are 2.4 and 2.19 when no electric field is applied, and then grow a layer of transparent electrodes on the silicon substrate, and then grow a layer of low refractive index BST film , and then grow a layer of high-refractive-index film, wherein the thickness of the low-refractive-index film is 66.5nm, and the thickness of the high-refractive-index film is 60.45nm. A total of 20 cycles were grown, and then the same transparent electrode was grown on the upper layer. When no electric field is applied, as image 3 As shown by the solid line, the central wavelength of the reflection spectrum is at 582nm, the peak is at about 92%, the spectral width is about 40nm, and it is bright yellow. Incident 582nm light, the film electric field mode field is as follows Figure 4 As shown in (b), it can be seen that the light propagates in the film layer, and the 582nm l...
Embodiment 3
[0041] In Embodiment 1 and Embodiment 2, the low refractive index material is first grown, and the high refractive index material is regrown. In this example, the high refractive index material is grown first, and the low refractive index material is grown again. When the number of growth cycles is 5, such as Figure 4 As shown, there is no single peak, so it cannot be used to make color-changing materials at this time. When the period number is 20, the reflection spectrum is the same as that of the first low refractive index and then high refractive index, and the high refractive index of the BST film is changed from 2.4 to 2.2, when the low refractive index changed from 2.19 to 2.0, the reflection spectrum was identical to that of Example 2. Therefore, the high first and then low refraction film with a cycle number of 20 can realize the color change from bright yellow to bright green.
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Abstract
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