Transparent light guide condenser for enhancing condensation energy

Abstract

The utility model provides a transparent light guide condenser capable of enhancing condensation energy, which is formed by superposing an upper light guide plate, a fluorescent diffusion film, a lower light guide plate and an angle light splitting optical film. The angle range and the reflection spectrum energy band range of internal reflection light which enters the light guide condenser and is restrained by a total reflection critical angle are effectively expanded, and the purpose of enhancing condensation energy is achieved. The device can be widely applied to the fields of spotlighting power generation and the like.

Description

Technical Field

[0001] This utility model relates to the field of optical technology, specifically to a transparent light guide concentrator that enhances light-gathering energy. Background Technology

[0002] The application of thin and transparent light-concentrating technology in the fields of concentrated lighting and power generation in new green, low-carbon, and intelligent buildings and new energy vehicles has great development potential and prospects for promoting energy structure transformation. In recent years, sandwich structures represented by "light guide plate-photoluminescent diffused film-light guide plate" have promoted the development and progress of transparent light-concentrating technology. However, the prominent problem of low light-concentrating efficiency has affected the application and promotion of this technology.

[0003] Currently, to improve the light-gathering efficiency of light guides, people have made some progress in researching and developing new photoluminescent materials to improve conversion efficiency and using high refractive index materials to reduce the critical angle of total internal reflection and reduce light escape from the surface of the light guide plate. However, the improvement in efficiency is not significant, and there is a large gap between practical application and commercialization. Summary of the Invention

[0004] To address the aforementioned problems in existing transparent light guide focusing technologies, this invention provides a transparent light guide concentrator that enhances focusing energy. Under the premise that the refractive index of the light guide plate and the conversion efficiency of the photoluminescent layer are determined, the spectral frequency shift effect of the multilayer optical thin film as the incident angle changes is utilized to effectively expand the angular range and the energy band range of the internally reflected light rays that are constrained by the critical angle of total internal reflection entering the light guide concentrator, thereby achieving the purpose of enhancing focusing energy.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] A transparent light guide concentrator for enhancing light concentration energy includes an upper light guide plate, a fluorescent diffusion film, and a lower light guide plate stacked sequentially from top to bottom. At least one side of the upper and lower surfaces of the lower light guide plate is coated with an angle-splitting optical film. The upper and lower light guide plates are transparent flat plates that are transparent on both the upper and lower surfaces and the sides, and their refractive index is n. The fluorescent diffusion film is a transparent film containing a photoluminescent agent and a light diffusing agent. The angle-splitting optical film highly reflects ultraviolet and infrared light, is transparent in the visible light band, and exhibits a spectral frequency shift effect with changes in the incident angle.

[0007] Preferably, an angle-splitting optical film is deposited on the lower surface of the lower light guide plate, and the fluorescent diffusion film is integrated with the lower surface of the upper light guide plate and the upper surface of the lower light guide plate.

[0008] An angle-splitting optical film is deposited on the upper surface of the lower light guide plate, or an angle-splitting optical film is deposited on both the upper and lower surfaces of the lower light guide plate.

[0009] The angle-splitting optical film has high reflectivity in the ultraviolet band of 250nm-400nm and the near-infrared band greater than 800nm, high transmittance in the visible light band of 400-700nm, and has the function of generating spectral frequency shift with the change of incident angle.

[0010] The aforementioned angular beam-splitting optical thin film is a composite multilayer film composed of niobium oxide (high refractive index material), silicon oxide (low refractive index material), and a silver alloy. The refractive indices of niobium oxide, silicon oxide, and the silver alloy are respectively: n H =2.356、n L =1.46, n M =0.0525-3.095i;

[0011] Its membrane structure is specifically: G / n L 100nm / n M 8.46nm / n L 106nm / n H 19nm / n M 19nm / n H 28.4nm / n L 10nm / Air.

[0012] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0013] 1) Given the refractive index of the light guide plate and the conversion efficiency of the photoluminescent layer, a new structure was designed. By utilizing the spectral frequency shift effect of the multilayer optical thin film as the incident angle changes, the angular range and the energy band range of the internally reflected light rays constrained by the critical angle of total internal reflection entering the light guide concentrator are effectively expanded, thereby achieving the purpose of enhancing the concentrated light energy.

[0014] 2) It has a strong synergistic effect with the development and progress of new materials for light guide plates and photoluminescent layers in this field. Its angle-splitting optical film can be optimized and adjusted in a timely manner according to the changes in the materials of light guide plates and photoluminescent layers, thereby enhancing its light-gathering efficiency and having strong practicality.

[0015] 3) The angle-splitting optical thin film described in this utility model can be manufactured by physical vapor deposition. Its industrial manufacturing technology is mature, economical, and easy to apply and promote. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of a transparent light guide concentrator structure for enhancing light concentration energy according to this utility model;

[0017] Figure 2 This is a schematic diagram of the spectral curve of the angle-splitting optical thin film and a schematic diagram of the light energy conversion of the light guide concentrator of this utility model;

[0018] Figure 3 This is a schematic diagram illustrating the effects of existing technology;

[0019] Figure 4 This is a schematic diagram illustrating the effect of Embodiment 1 of this utility model;

[0020] Figure 5 This is a schematic diagram of the spectrum of an embodiment of the angle-dispersive optical thin film of this utility model;

[0021] Explanation of reference numerals in the attached figures:

[0022] 01-Upper light guide plate, 02-Fluorescent diffusion film, 03-Lower light guide plate, 04-Angle beam splitting optical film;

[0023] I C I is the critical angle for total internal reflection of the light guide plate. C =arcSin(1 / n);

[0024] R θ The reflected light rays that are incident at an angle θ on the surface of the angle-splitting optical thin film are refracted and reflected from inside the optical guide concentrator.

[0025] T θ The transmitted light after the refraction and reflection of light rays inside the optical guide concentrator are incident at an angle θ onto the angle-splitting optical film;

[0026] λ(θ) is the spectral frequency shift wavelength after incident at an angle θ onto the angle-splitting optical thin film;

[0027] E S The light energy incident on the upper surface of the light guide concentrator;

[0028] E Rθ The light energy incident at an angle θ onto the surface of the angle-splitting optical thin film and reflected into the light guide concentrator;

[0029] E Tθ The energy of the emitted light after being incident at an angle θ and transmitted through the angle-splitting optical thin film;

[0030] UV, E UV These represent the reflected energy in the ultraviolet and ultraviolet bands, respectively.

[0031] NIR, E NIR These represent the reflected energy of near-infrared and near-infrared bands, respectively.

[0032] VIS stands for Visible Light. Detailed Implementation

[0033] The technical solution of this utility model will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0034] Example 1: As Figure 1As shown, a transparent light guide concentrator for enhancing light concentration energy is constructed by stacking an upper light guide plate 01 with a refractive index of n, a fluorescent diffusion film 02, and a lower light guide plate 03 with a refractive index of n sequentially from top to bottom. An angle-splitting optical film 04 is deposited on the lower surface of the lower light guide plate. The upper and lower light guide plates are transparent flat plates that are transparent on both their top and bottom surfaces and sides. The fluorescent diffusion film is a transparent film containing a photoluminescent agent and a light diffusing agent, and it is integrally bonded to the lower surface of the upper light guide plate and the upper surface of the lower light guide plate. The angle-splitting optical film highly reflects ultraviolet and infrared light, is transparent in the visible light band, and exhibits a spectral frequency shift effect with changes in the incident angle.

[0035] Figure 1 The optical path of the light in the optical guide concentrator constructed by this invention is described in detail, from incident to internal scattering and internal reflection to exit.

[0036] like Figure 2 As shown, the angle-splitting optical thin film 04 exhibits high reflectivity for ultraviolet and infrared light, and high transmittance in the visible light band. Under normal incidence (0°) conditions, the high transmittance in the visible light band ensures the transparency of the photoconductor concentrator. This transmittance varies with the incident angle θ. C When the spectral characteristics vary within the range of >θ>0°, the overall frequency shift will be towards shorter wavelengths to λ(θ). The band below λ(θ) is the transmission band, and the emitted light energy is E. Tθ The band with wavelengths greater than λ(θ) is the reflection band, forming a reflected energy E. Rθ .

[0037] Figure 2 The present invention describes in detail, based on its structure, the light energy conversion path and the principle of energy enhancement of light incident into the light guide concentrator, such as... Figure 2 As shown, the incident ray has an energy of E. S After being incident on the fluorescent diffusion film 02 via the upper light guide plate 01, the photoluminescent rays and scattered rays at various angles are incident on the angle-splitting optical film 04 via the lower light guide plate 03. This not only exceeds the critical angle of total internal reflection I... C The light rays are reflected and propagated within the light guide concentrator to be focused on the side. Due to the high reflectivity of the angle-splitting optical film for the UV and NIR bands, E UV With E NIR All light is reflected back into the fluorescent diffusion film 02 to re-excite photoluminescence and scatter through a transmission-reflection cycle. Simultaneously, after being incident at an incident angle θ onto the angle-splitting optical film 04, the transmitted light energy E in the visible light band... Tθ The emitted and reflected light energy E Rθ The light is reflected back into the fluorescent diffusion film 02 and diffused, then enters the transmission and reflection cycle. This repeated cycle enhances the light-concentrating energy of the light guide.

[0038] Figure 3 and Figure 4 The effects of existing technologies were compared with those of this utility model. Figure 3 In the existing "light guide plate-photoluminescent diffused film-light guide plate" structure, light focusing mainly depends on an internal total internal reflection critical angle I greater than or equal to. C The light energy in the range propagates and concentrates towards the side of the light guide, which is less than the critical angle I for total internal reflection. C All light energy in the range will escape and be emitted, including light energy in the UV and NIR bands. Figure 4 The structure of this utility model emits light rays of type T. θ The rest are all refracted back into the internal circulation of the light guide concentrator.

[0039] Figure 5 For the preferred embodiment of the angle-splitting optical thin film 04, niobium oxide (n) is a high-refractive-index material. H =2.356), low refractive index material silicon dioxide (n L =1.46), silver alloy (n M A composite multilayer membrane composed of (=0.0525-3.095i) has the following specific membrane structure: G / n L 100nm / n M 8.46nm / n L 106nm / n H 19nm / n M 19nm / n H 28.4nm / n L 10nm / Air.

[0040] The optical characteristics of this angle-splitting thin film are as follows: under 0° incident conditions, the reflectance R > 85%-90% in the 250nm-400nm ultraviolet band, the reflectance R > 95% in the 800nm-2500nm near-infrared band, and the transmittance T > 90% in the 400-700nm visible light band. It has the function of generating spectral frequency shift with the change of incident angle. Under 40° incident conditions, the reflectance change in the 600nm-700nm band is R > 92%.

[0041] Example 2: Unlike Example 1, an angle-splitting optical film is deposited on the upper surface of the lower light guide plate, or an angle-splitting optical film is deposited on both the upper and lower surfaces.

[0042] The above description is only a description of the structure constituting this utility model, the principle of light-guiding and light-concentrating enhancement, and the application embodiment of the angle-splitting optical thin film. It is not intended to limit the scope of this invention. Without departing from the spirit of this invention, all modifications and improvements made by those skilled in the art to the technical solutions of this invention should fall within the protection scope defined by the claims of this invention.

Claims

1. A transparent light guide concentrator for enhancing concentrated light energy, characterized in that: The device comprises an upper light guide plate, a fluorescent diffusion film, and a lower light guide plate stacked sequentially from top to bottom. At least one side of the upper and lower surfaces of the lower light guide plate is coated with an angle-splitting optical film. The upper and lower light guide plates are transparent flat plates that are transparent on both the upper and lower surfaces and the sides, and their refractive index is n. The fluorescent diffusion film is a transparent film containing a photoluminescent agent and a light diffusing agent. The angle-splitting optical film highly reflects ultraviolet and infrared light, is transparent in the visible light band, and exhibits a spectral frequency shift effect with changes in the incident angle.

2. The transparent light guide concentrator for enhancing concentrated light energy according to claim 1, characterized in that: An angle-splitting optical film is deposited on the lower surface of the lower light guide plate, and the fluorescent diffusion film is integrated with the lower surface of the upper light guide plate and the upper surface of the lower light guide plate.

3. A transparent light guide concentrator for enhancing concentrated light energy according to claim 1, characterized in that: An angle-splitting optical film is deposited on the upper surface of the lower light guide plate, or an angle-splitting optical film is deposited on both the upper and lower surfaces of the lower light guide plate.

4. A transparent light guide concentrator for enhancing concentrated light energy according to claim 1, characterized in that: The angle-splitting optical film has high reflectivity in the ultraviolet band of 250nm-400nm and the near-infrared band greater than 800nm, high transmittance in the visible light band of 400-700nm, and has the function of generating spectral frequency shift with the change of incident angle.

5. A transparent light guide concentrator for enhancing concentrated light energy according to claim 1, characterized in that: The aforementioned angular beam-splitting optical thin film is a composite multilayer film composed of niobium oxide (high refractive index material), silicon oxide (low refractive index material), and a silver alloy. The refractive indices of niobium oxide, silicon oxide, and the silver alloy are respectively: n H =2.356、n L =1.46, n M =0.0525-3.095i; its membrane structure is specifically: G / n L 100nm / n M 8.46nm / n L 106nm / n H 19nm / n M 19nm / n H 28.4nm / n L 10nm / Air.

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