A clear sky lighting device based on quantum rods

Abstract

The present application relates to a kind of based on quantum rod clear sky lighting device, including light source module and light transmission plate, light source module is set at the back side of light transmission plate, light emitted by light source module is emitted through light transmission plate and forms illumination;Light source module includes white LED lamp pearl, double-waveband excitation light source for blue light excitation, controller and spectrum sensor, double-waveband excitation light source includes blue light excitation light source and ultraviolet excitation light source, spectrum sensor is used to monitor the blue light wavelength distribution output by the double-waveband excitation light source in real time, spectrum sensor is electrically connected with the corresponding input end of controller, double-waveband excitation light source is electrically connected with the corresponding output end of controller;The main body of light transmission plate is quantum rod function layer, quantum rod function layer is transparent layer with quantum rod distribution, quantum rod uses blue light quantum rod.This clear sky lighting device can not only be light and compact, low in manufacturing cost, and scattering efficiency is high, and has good eye protection effect to user.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of lighting, in particular to a clear sky lighting device based on quantum rods. BACKGROUND

[0002] As an indoor lighting device, the clear sky lamp is generally a surface lamp suitable for installation on the ceiling, which can simulate the blue sky effect of atmospheric scattered sunlight at the light outlet, not only meeting the lighting needs of the indoor, but also improving the indoor environment atmosphere.

[0003] A blue sky lamp lighting device is disclosed in Chinese Utility Model Patent No. CN222122927U, which comprises a rectangular lamp shell and a Rayleigh scattering plate and a light emitting assembly installed in the lamp shell. The light emitting assembly is composed of a first light source, a second light source, and a first light barrier and a second light barrier. The light rays of the first light source and the second light source are respectively irradiated on the Rayleigh scattering plate area on the other side through the gap between the first light barrier and the second light barrier. Part of the light rays produce Rayleigh scattering to achieve a blue sky effect, and the remaining light rays that pass through the area achieve a double-sided light emitting effect. The lighting device is suitable for lighting in narrow passageway spaces such as corridors, can uniformly distribute light on both sides of the wall without direct entry into the human eye, and effectively simulates a blue sky lighting effect indoors. However, the Rayleigh scattering plate in this blue sky lamp lighting device needs a thickness ≥ 5 mm to achieve a uniform blue sky effect, such as the rectangular lamp shell structure in Chinese Utility Model Patent No. CN222122927U, resulting in a heavy lamp and fast light efficiency decay.

[0004] In addition, the existing part of the clear sky lamp emits scattered blue light with a 420-450 nm high frequency band ratio > 30%, which may cause retinal photochemical damage to users after long-term exposure. In addition, the structure of some clear sky lamps is complex, which requires adjusting the light path through multiple light barriers, resulting in high manufacturing cost and limited light uniformity. SUMMARY

[0005] The technical problem to be solved by the present application is to provide a clear sky lighting device based on quantum rods, which not only has a light structure and low manufacturing cost, but also has high scattering efficiency and good eye protection effect for users. The technical scheme adopted is as follows:

[0006] A kind of cerulean sky lighting device based on quantum rod, including light source module and light-transmitting plate, light source module is arranged at the back side of light-transmitting plate, light emitted by light source module is emitted through light-transmitting plate and forms illumination;Characterized in that: the light source module includes white LED lamp pearl, double-waveband excitation light source for blue light excitation, controller and spectral sensor, white LED lamp pearl can emit light containing non-blue visible light component, double-waveband excitation light source includes blue light excitation light source and ultraviolet excitation light source, spectral sensor is used to monitor the wavelength distribution of blue light output by the double-waveband excitation light source in real time, spectral sensor is electrically connected with the corresponding input end of controller, double-waveband excitation light source is electrically connected with the corresponding output end of controller;The main body of the light-transmitting plate is quantum rod function layer, quantum rod function layer is transparent layer with quantum rod distributed, quantum rod adopts blue light quantum rod.

[0007] The above-mentioned blue light quantum rod refers to a quantum rod that emits blue light, which generally selects a quantum rod that emits low-frequency blue light, and the emission wavelength of the blue light quantum rod can be accurately controlled to 460-480 nm low-frequency blue light, thereby eliminating the emission of high-frequency blue light (420-450 nm), so as to play a role in protecting eyes.

[0008] The above-mentioned white LED lamp pearl can adopt LED lamp pearl that emits warm white or cool white light, which can be fixed in color or adjustable in color. For example: the light source module can be provided with warm white LED lamp pearl and cool white LED lamp pearl at the same time;By adjusting the light and dark ratio of the light emitted by these white LED lamp pearls, different light colors can be simulated, such as simulating the light of morning, noon or evening. These white LED lamp pearls can also be equipped with condenser lenses, which aim to converge scattered light and make it irradiate to the light-transmitting plate, for example: make the light obliquely irradiate to the light-transmitting plate and form illumination through the light-transmitting plate.

[0009] Specifically, the above-mentioned double-waveband excitation light source can adopt the combination of COB packaging 420 nm high-frequency blue light LED (main excitation light source, accounting for 90%) and 405 nm ultraviolet LED (auxiliary excitation light source, accounting for 10%), and realize dynamic matching of excitation light intensity through PWM dimming.

[0010] In the quantum rod-based clear sky lighting device, the quantum rod functional layer is used as the main body of the light-transmitting plate, the quantum rod functional layer is a transparent layer in which blue light quantum rods are distributed, the light emission of the blue light quantum rods can only be excited by the high-frequency components (high-frequency blue light and / or ultraviolet light) in the light emitted by the white LED lamp bead, and the light emission of the blue light quantum rods is isotropic after excitation, so that a scattering effect can be formed, which is equivalent to or replaces the Rayleigh scattering effect, so that the light-transmitting plate looks blue as a whole and the color of the sky on a sunny day can be simulated; the light emitted by the white LED lamp bead contains non-blue visible light components, which are not absorbed by the blue light quantum rods, so that the light can be directly transmitted through the light-transmitting plate to present a sunlight direct irradiation effect; compared with the existing Rayleigh scattering plate, the light conversion efficiency of the quantum rod functional layer is high, so the thickness of the light-transmitting plate can be thin, thereby making the structure of the clear sky lighting device light and low in manufacturing cost, and the high-frequency blue light / ultraviolet light can be converted into low-frequency blue light, and the scattering efficiency is higher. In addition, the light source module integrates a double-waveband excitation light source (a blue light excitation light source and an ultraviolet light excitation light source) and a white LED lamp bead, so that the light spectrum can be adjusted to simulate early and late light, thereby realizing dynamic dimming. When the proportion of the 460-480nm waveband output by the double-waveband excitation light source is lower than a preset value, the controller automatically adjusts the power of the ultraviolet light excitation light source (such as a 405nm ultraviolet LED) to compensate for the light conversion efficiency, or the ultraviolet light excitation light source (such as a 405nm ultraviolet LED) is turned off in the night mode, so as to ensure that the harmful blue light radiation intensity meets the safety standards and has a good eye protection effect on the user.

[0011] Generally, the quantum rod is in the shape of a rod, and the cross section thereof can be circular, elliptical or polygonal, etc. In terms of the size of the quantum rod, both the length and the diameter of the quantum rod can be controlled in the nanometer scale, and the length is generally greater than the Bohr radius of an exciton. In terms of the material selection of the quantum rod, the quantum rod adopts a semiconductor material capable of emitting visible light, and by adjusting the composition and proportion of the material, light emission of different wavelengths can be realized.

[0012] As a preferred scheme of the present application, the quantum rod adopts an InP / ZnS core-shell quantum rod.

[0013] As a further preferred scheme of the present application, the InP / ZnS core-shell quantum rod is formed by anisotropic growth, the InP / ZnS core-shell quantum rod comprises a core and a shell wrapped outside the core, the core is composed of ZnS material, the shell is composed of InP material, the diameter of the quantum rod is between 3-4nm, and the length of the quantum rod is between 15-20nm. The anisotropic growth of the InP / ZnS core-shell quantum rod enhances the light conversion efficiency; generally, the excitation wavelength of the quantum rod is between 380-420nm, the emission wavelength is accurately controlled to 460-480nm low-frequency blue light, the half peak width is less than 18nm, the quantum yield is greater than 85%, and the light efficiency of the traditional scattering plate is only 50%.

[0014] As a further preferred scheme of the present application, the light-transmitting plate comprises a substrate, the quantum rod functional layer and a scattering enhancement layer, the quantum rod functional layer is arranged on the back side of the substrate, the scattering enhancement layer is arranged on the back side of the quantum rod functional layer, and the scattering enhancement layer is a nano-porous SiO2 layer. The light-transmitting plate is composed of multiple materials, which can achieve a better blue light filtering effect, and the nano-porous SiO2 layer can also enhance the uniformity of the quantum rod light emission by using the multiple scattering property of the nano-porous SiO2 layer, and the nano-porous SiO2 layer can also absorb high-energy photons with a residual wavelength less than 450 nm.

[0015] As a still further preferred scheme of the present application, the quantum rod functional layer is prepared by dispersing the InP / ZnS core-shell quantum rod in polycarbonate pellets at a concentration of 6-12 wt% and by using an injection molding process, and the thickness of the light-transmitting plate is between 1-2 mm and the light transmittance is greater than 90%. In this scheme, the quantum rod-PC composite layer injection molding process (concentration 6-12 wt%, mold temperature 80℃) is used, which can improve the manufacturing efficiency by 40% compared with the traditional Rayleigh scattering plate, and the light flux maintenance rate of the light-transmitting plate is 92% (68% for the traditional scheme).

[0016] Generally, the light source module and the light-transmitting plate have a relative determined positional relationship. As a preferred scheme of the present application, the clear sky lighting device further comprises a lamp box, the front end of the lamp box is provided with a light outlet, the light-transmitting plate is arranged at the light outlet, and the light source module is mounted in the lamp box. Generally, the inner wall of the lamp box is provided with light extinction treatment, such as blackening treatment, to avoid the influence of stray light on the blue sky effect.

[0017] Generally, the clear sky lighting device further comprises a fixing structure and a lighting driving module. The fixing structure can be a PCB board for fixing the LED. The lighting driving module generally has basic voltage conversion and rectification functions, which can provide the required voltage or current for the lighting elements such as LEDs. In some simple embodiments, the lighting driving module can directly output the required voltage or current for the lighting elements according to the power-on of the lighting device (controlled by an indoor switch, for example). In some complex embodiments, the lighting driving module can also have timing adjustment function, remote control receiving function or wireless (such as Bluetooth, WIFI) receiving function, which allows the user to control the light emitting brightness of the lighting elements through timing, remote control or wireless means. Especially for the variable color scheme, the lighting driving module can also have a color adjusting function, for example, it can output corresponding current for LEDs of different colors to change the color. In order to improve the stability and durability of the light source module, the light emitting component can also be provided with a heat dissipation structure, such as a heat sink or even a heat dissipation fan connected to the fixing structure.

[0018] Compared with the prior art, the present application has the following advantages:

[0019] (1) The sky lighting device adopts a light-transmitting plate with a quantum rod functional layer as the main body to replace the Rayleigh scattering plate used in the traditional sky lamp, which can solve the problems of low scattering efficiency, large device thickness and harmful high-frequency blue light residue in the prior art. Not only is the thickness more lightweight, the structure is compact, the manufacturing cost is low, but also the high-frequency blue light / ultraviolet light can be converted to low-frequency blue light, and the scattering efficiency is high.

[0020] (2) The light source module in the sky lighting device integrates double-waveband excitation light sources (blue excitation light source and ultraviolet excitation light source) and white LED lamp beads, which can realize spectrum adjustment to simulate morning and evening light, and dynamic dimming. When the spectrum sensor detects that the proportion of the 460-480nm waveband output by the double-waveband excitation light source is lower than the preset value, the controller automatically adjusts the power of the ultraviolet excitation light source (such as 405nm ultraviolet LED) to compensate for the light conversion efficiency, or turns off the ultraviolet excitation light source (such as 405nm ultraviolet LED) in the night mode, ensuring that the harmful blue light radiation intensity meets the safety standards, and having good eye protection effect on users, suitable for indoor office, medical and other scenes. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 is a structural schematic diagram of the sky lighting device of the preferred embodiment of the present application.

[0022] Figure 2 is Figure 1 a structural schematic diagram of the light-transmitting plate in the sky lighting device shown. DETAILED DESCRIPTION

[0023] Example 1, as Figures 1-2 shown, the sky lighting device based on quantum rods includes a lamp box 1, a light source module 2 and a light-transmitting plate 3. The front end of the lamp box 1 is provided with a light outlet 101, the light-transmitting plate 3 is arranged at the light outlet 101, and the light source module 2 is installed in the lamp box 1 and located at the rear side of the light-transmitting plate 3. The light emitted by the light source module 2 is emitted through the light-transmitting plate 3 to form illumination. The main body of the light-transmitting plate 3 is a quantum rod functional layer 31. The quantum rod functional layer 31 is a transparent layer with quantum rods distributed therein, and the quantum rods are blue quantum rods.

[0024] In the embodiment, the light source module 2 comprises white LED lamp beads 21 capable of emitting light containing non-blue visible light components. The white LED lamp beads 21 emit light containing non-blue visible light components, which are not absorbed by the blue light quantum rods, and thus can be directly transmitted through the light transmission plate 3 to present the effect of direct sunlight. The white LED lamp beads 21 can adopt LED lamp beads with warm white or cold white light emission, which can be fixed light emission color or adjustable light emission color. For example, the light source module 2 can simultaneously set warm white LED lamp beads 21 and cold white LED lamp beads 21; by adjusting the light and dark ratio of the light emission of these white LED lamp beads 21, different light colors can be simulated, such as simulating the light of morning, noon or evening. These white LED lamp beads 21 can also be equipped with a condenser lens, which aims to converge the dispersed light and make it irradiate to the light transmission plate 3, for example, to make the light obliquely irradiate to the light transmission plate 3 and form illumination through the light transmission plate 3.

[0025] The clear sky lighting device also comprises a fixing structure and a lighting driving module. The fixing structure adopts an aluminum substrate for fixing the LED. The lighting driving module generally has a basic voltage rectification function, which can provide the required voltage or current for the lighting elements such as LED. In some simple embodiments, the lighting driving module can directly output the required voltage or current for the lighting elements according to the power-on of the lighting device (such as controlled by the indoor switch). In some complex embodiments, the lighting driving module can also have a timing adjustment function, a remote control receiving function or a wireless (such as Bluetooth, WIFI) receiving function, which allows the user to control the light emission brightness of the lighting elements through timing, remote control or wireless means. Especially for the variable color scheme, the lighting driving module can also have a color adjusting function, for example, it can output corresponding current for different color LEDs to change the color. In order to improve the stability and durability of the light source module 2, the light emitting components can also be provided with heat dissipation structures, such as heat dissipation fins or even heat dissipation fans connected to the fixing structure. The inner wall of the light box 1 is provided with light extinction treatment, such as blackening treatment, to avoid the influence of stray light on the blue sky effect.

[0026] In the embodiment, the quantum rod adopts InP / ZnS core-shell quantum rod formed by anisotropic growth. The InP / ZnS core-shell quantum rod comprises a core and a shell wrapped outside the core. The core is composed of ZnS material, and the shell is composed of InP material. The diameter of the quantum rod is between 3-4 nm, and the length of the quantum rod is between 15-20 nm. The anisotropic growth of the InP / ZnS core-shell quantum rod enhances the light conversion efficiency. Generally, the excitation wavelength of the quantum rod is between 380-420 nm, the emission wavelength is accurately adjusted to 460-480 nm low frequency blue light, the half peak width is less than 18 nm, the quantum yield is greater than 85%, and the light efficiency of the traditional scattering plate is only 50%.

[0027] In the present embodiment, the light-transmitting plate 3 comprises a substrate 30, a quantum rod functional layer 31 and a scattering enhancement layer 32, the quantum rod functional layer 31 is disposed on the back side of the substrate 30, the quantum rod functional layer 31 is prepared by dispersing InP / ZnS core-shell quantum rods in polycarbonate pellets at a concentration of 6-12 wt% through an injection molding process; the scattering enhancement layer 32 is disposed on the back side of the quantum rod functional layer 31, the scattering enhancement layer 32 is a nano-porous SiO2 layer; the thickness of the light-transmitting plate 3 is between 1-2 mm, and the light transmittance is greater than 90%. Specifically, the substrate 30 adopts a 2 mm thick impact-resistant PMMA plate (light transmittance 92%); the quantum rod functional layer 31 adopts a 1.5 mm thick InP / ZnS core-shell quantum rod-PC composite layer (concentration 10 wt%); the scattering enhancement layer 32 adopts a 200 μm thick nano-porous SiO2 layer (pore size 50-100 nm). The light-transmitting plate 3 adopts a multi-layer material composite, which can achieve a more optimal blue light filtering effect; the nano-porous SiO2 layer is used to enhance the uniformity of quantum rod light emission by multiple scattering, while absorbing high-energy photons with a residual wavelength less than 450 nm.

[0028] After testing, the comparison between the light-transmitting plate 3 in the present embodiment and the Rayleigh scattering plate in the traditional sky blue lamp in terms of various parameters and technical effects is as follows:

[0029] (1) The thickness of the light-transmitting plate 3 in the present embodiment is 1.5 mm, and the thickness of the Rayleigh scattering plate in the traditional sky blue lamp is 5 mm; it can be seen that the thickness of the light-transmitting plate 3 is much thinner than that of the Rayleigh scattering plate;

[0030] (2) The light conversion efficiency of the light-transmitting plate 3 in the present embodiment is 88.5%, and the light conversion efficiency of the Rayleigh scattering plate in the traditional sky blue lamp is 50%; it can be seen that the light conversion efficiency of the light-transmitting plate 3 is higher than that of the Rayleigh scattering plate;

[0031] (3) The shielding rate of harmful blue light of the light-transmitting plate 3 in the present embodiment is 98.1%, and the shielding rate of harmful blue light of the Rayleigh scattering plate in the traditional sky blue lamp is 70%; it can be seen that the shielding rate of harmful blue light of the light-transmitting plate 3 is higher than that of the Rayleigh scattering plate;

[0032] (4) The light flux maintenance rate of the light-transmitting plate 3 in the present embodiment is 92%, and the light flux maintenance rate of the Rayleigh scattering plate in the traditional sky blue lamp is 68%; it can be seen that the light flux maintenance rate of the light-transmitting plate 3 is higher than that of the Rayleigh scattering plate.

[0033] In Embodiment Two, other parts are the same as Embodiment One, and the difference is that the light source module 2 further comprises a double-band excitation light source for blue light excitation, the double-band excitation light source comprises a COB package 420 nm high-frequency blue light LED (main excitation light source, accounting for 90%) and a 405 nm ultraviolet LED (auxiliary excitation light source, accounting for 10%), and the 420 nm high-frequency blue light LED and the 405 nm ultraviolet LED are arranged alternately (with a spacing of 4 mm). Thus, dynamic dimming can be realized, high-frequency blue light / ultraviolet light can be converted into low-frequency blue light, and the scattering efficiency is higher. The light source module 2 integrates the double-band excitation light source, combines with the ordinary white light LED to realize the adjustable spectrum (simulates the morning and evening light), and absorbs the residual high-energy photons through the nano-porous SiO2 layer.

[0034] In the embodiment, the light source module 2 further comprises a controller and a spectrum sensor, the spectrum sensor is used to monitor the wavelength distribution of the blue light output by the double-band excitation light source in real time, the spectrum sensor is electrically connected to the corresponding input end of the controller, and the double-band excitation light source is electrically connected to the corresponding output end of the controller. When the spectrum sensor detects that the proportion of the 460-480 nm band output by the double-band excitation light source is less than 95%, the controller automatically increases the power of the 405 nm ultraviolet LED to compensate for the conversion efficiency, or in the night mode (color temperature < 4000K), the 405 nm ultraviolet light source is turned off, and the conversion of the 420→460 nm quantum rod is completely relied on, to ensure that the harmful blue light radiation intensity is <0.3 W / m²·sr (complying with the IEC 62471 Class 0 safety standard).

[0035] In addition, it should be noted that the specific embodiments described in the specification can have different names and the like, and any equivalent or simple changes made in accordance with the structure, features and principles of the patent concept of the present application are included in the protection scope of the present application. Those skilled in the art can make various modifications or supplements to the described specific embodiments or use similar ways to replace them, as long as they do not deviate from the structure of the present application or exceed the scope defined by the present claims, and should belong to the protection scope of the present application.

Claims

1. A quantum rod-based clear sky lighting device, comprising a lamp box, a light source module and a light-transmitting plate, the front end of the lamp box being provided with a light outlet, the light-transmitting plate being arranged at the light outlet, the light source module being installed in the lamp box and being located at the rear side of the light-transmitting plate, the light emitted by the light source module being emitted through the light-transmitting plate to form illumination; characterized in that: The light source module comprises a white LED lamp bead capable of emitting light containing a non-blue visible light component, a double-waveband excitation light source for blue light excitation, a controller and a spectrum sensor, the double-waveband excitation light source comprises a blue light excitation light source and an ultraviolet light excitation light source, the spectrum sensor is used for monitoring the wavelength distribution of the blue light output by the double-waveband excitation light source in real time, the spectrum sensor is electrically connected to the corresponding input end of the controller, and the double-waveband excitation light source is electrically connected to the corresponding output end of the controller; the light-transmitting plate comprises a substrate, a quantum rod functional layer and a scattering enhancement layer, the quantum rod functional layer is arranged on the back side of the substrate, and the scattering enhancement layer is arranged on the back side of the quantum rod functional layer, the quantum rod functional layer is a transparent layer in which quantum rods are distributed, the quantum rods are blue light quantum rods, and the scattering enhancement layer is a nano-porous SiO2 layer.

2. A clear sky lighting device based on quantum rods according to claim 1, characterized in that: The quantum rod is an InP / ZnS core-shell quantum rod.

3. A clear sky lighting device based on quantum rods according to claim 2, characterized in that: The InP / ZnS core-shell quantum rod is formed through anisotropic growth, the InP / ZnS core-shell quantum rod comprises a core and a shell wrapped outside the core, the core is composed of ZnS material, the shell is composed of InP material, the diameter of the quantum rod is between 3-4 nm, and the length of the quantum rod is between 15-20 nm.

4. A clear sky lighting device based on quantum rods according to claim 3, characterized in that: The quantum rod functional layer is prepared through an injection molding process by dispersing the InP / ZnS core-shell quantum rod in polycarbonate particles at a concentration of 6-12 wt%, the thickness of the light-transmitting plate is between 1-2 mm, and the light transmittance is greater than 90%.

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