CN112951969A

CN112951969A - Long afterglow LED

Info

Publication number: CN112951969A
Application number: CN202110343453.4A
Authority: CN
Inventors: 方显峰
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-03-30
Filing date: 2021-03-30
Publication date: 2021-06-11

Abstract

The long afterglow LED comprises an LED wafer (1), accessories, a support (2), a light distribution inner lens (3) and a long afterglow luminous lens body (4), wherein the LED wafer (1), the accessories and the support (2) are packaged in the transparent light distribution inner lens (3), the top of the light distribution inner lens (3) is an optical part with a light distribution emitting function, the long afterglow luminous lens body (4) is an optical structure luminous forming body formed by mixing long afterglow luminous powder and a light-transmitting mixed medium in proportion and forming through liquid solidification or molten solidification, and the transparent light guide medium surrounds or partially surrounds the side wall of the light distribution inner lens (3) through a liquid solidification mode or a molten solidification mode or a conjunction structure to form an LED whole with LED light distribution emitting and afterglow luminous functions; the light distribution proportion of light energy can be adjusted, the emergent light field is distributed with light, and at least part of emergent light of the LED luminous body can be emergent according to the light path design while the advantage of afterglow luminescence is kept.

Description

Long afterglow LED

Technical Field

The invention relates to the field of luminous LEDs, in particular to a long afterglow LED.

Background

The long afterglow luminescent material, also called luminous material, is a photoluminescence material: under the excitation of a light source, visible light is emitted, part of the obtained light energy is stored, after the excitation is stopped, the energy is slowly released in the form of light, and the luminous brightness of the luminescent material is related to the performance of the luminescent material and the thickness of the long afterglow luminescent layer and the concentration of the long afterglow luminescent powder in the luminescent material; because of the continuous development and progress of the electroluminescence excitation long afterglow technology, the luminous brightness of the long afterglow material is greatly improved, which is gradually paid attention in the years, and the long afterglow material is applied to various light emitting equipment fields, is popular with markets and consumers, forms industry and local standards, and has already formed industrialized development.

In this context, long persistence LEDs have been developed by combining long persistence with LED chips. For example, patent nos. CN101776213B, CN205723621, CN104170103A, and 206890416u, a long afterglow coating is coated on the LED lamp bead in a covering manner, or the outer surface of the LED lamp bead is completely covered with a long afterglow lamp shell, or for example, patent nos. 2007100302054, 2016205208975, and 2016205176048, a long afterglow light emitting packaging layer is disposed on the top of the lens of the LED lamp bead. The existing long afterglow LED is manufactured by the two methods, although the afterglow luminous effect after the lamp is turned off can be realized, the following main defects exist:

1. the existing long-afterglow LED is arranged at the top of the LED or is completely coated on the LED bead, and because the LED is generally Lambert, the luminous intensity in the direction of the main optical axis is larger, most of the emergent light of the LED is emitted from the top of the LED bead, and because of the absorption and scattering of the long-afterglow luminous powder, the loss of the emergent light energy is overlarge when the LED emits light, and especially, the light beam angle of the LED is overlarge, and the light distribution effects such as light condensation and long shot cannot be achieved.

2. The emergent light is the composite light of the LED and the long afterglow excited light, so the hue drift exists, and the influence on the original LED spectrum is too large.

3. Because the light intensity near the LED is very high and far exceeds the intensity of saturation excitation required by the long afterglow material, unnecessary light energy is wasted, the total luminous efficiency of the LED is low, and the service performance of the LED is greatly influenced.

4. When a multi-chip LED or a single LED is adopted for emitting light in multiple colors, the colored light which is not in the long afterglow excitation spectrum range is influenced by the shading of the long afterglow luminous body, and the light energy is wasted.

In short, the long-afterglow LED in the prior art has the fatal defects and other defects, so that the development of the long-afterglow LED is limited, and the long-afterglow LED becomes a difficult problem to be solved urgently in the industry.

Disclosure of Invention

Aiming at the problems, the technical problems to be solved by the invention are as follows:

the invention discloses a novel long-afterglow LED, which is formed by

a. The LED chip has the LED light distribution and emission function, particularly, the LED chip has the LED light distribution and emission function, and can enable at least part of emitted main beams of the LED chip to be emitted according to the light path design [ parameters such as light condensation, divergence or deflection (the emitted main beams and a light emitting main shaft are emitted in an acute angle) or polarization (sometimes called side light, the emitted light energy distribution of one side is larger than that of the other side) and the like ] can be realized, so that the emitted light can meet the special requirements of fixed-point (area) light projection or directional (angle) projection of the main beams; the whole body has a long afterglow luminous effect with high brightness.

b. The long afterglow luminous body can keep afterglow luminescence, and simultaneously the LED can emit light with the natural color (original luminous performance and luminous wavelength), so that the light interference (chromaticity shift and the like) caused by the original luminous characteristic of the LED when the long afterglow excited light is reduced.

c. The ratio of the light energy of the emergent light part of the long afterglow LED and the exciting light part for exciting the long afterglow luminescence can be distributed according to the design requirement, the light energy utilization rate is high, namely, the light close to the main shaft of the luminescence does not pass through the light distribution emergence of the long afterglow luminous body, and the luminous intensity is higher; the light far away from the main light-emitting shaft has lower light-emitting intensity and is used for exciting the long-afterglow light-emitting body; especially when a multi-chip LED or a single LED is adopted for emitting light in multiple colors, the colored light which is not in the long afterglow excitation spectrum range is not influenced by the shading of the long afterglow luminous body; the light energy utilization rate of the overall light emission of the LED is high, and the light emitting effect is good.

d. The long afterglow luminescence lens also has other advantages, such as realizing the afterglow brightening effect of the superimposed luminescence mainly at the adjacent part of the long afterglow (generally in the surrounding area of the long afterglow luminescence lens body) during the long afterglow luminescence, and playing a role in brightening; the light-emitting diode has the advantages of higher light energy utilization rate, better universality, more excellent light-emitting performance, higher integration level and standardization level, high convenience degree and wider applicability, is particularly favorable for remote transmission, and is particularly suitable for security protection purposes such as warning, indication and the like.

The design idea of the invention can be understood that because the LED luminous body is a lambertian body (as shown in FIG. 4), the light intensity closer to the main axis of light emission is larger, and the light intensity farther away from the main axis of light emission is smaller; therefore, as shown in fig. 5, a position (such as a top position) close to the light-emitting main shaft is an LED light-transmitting emitting position, the LED emits light in a natural color (original light-emitting performance and light-emitting wavelength) with high light-emitting brightness and long range, and a position (a side position) far away from the light-emitting main shaft is a long afterglow position, when the LED emits light, the long afterglow light-emitting body is excited by relatively weak light intensity to be excited by excitation light, and after the LED is extinguished, the LED emits light through afterglow, so that the LED has a long afterglow light-emitting function; if the solid angle ratio or area ratio of the long-afterglow luminous body is to be reduced to appropriately reduce the light emitting area of the long-afterglow luminous body in order to emphasize the LED emission effect, and if the long-afterglow luminous effect is to be emphasized, the solid angle ratio or area ratio of the long-afterglow luminous body is to be increased to increase the light emitting area of the long-afterglow luminous body.

The technical scheme of the invention is as follows: a long afterglow LED, as shown in figures 1-3, comprises an LED wafer (1) and accessories, a support (2), an inner lens (3) of light distribution, wherein the inner lens (3) of light distribution is a transparent optical lens, the support (2) comprises an anode frame and a cathode frame, the anode frame or the cathode frame is provided with the LED wafer (1) and the accessories (general), the top of the anode frame or the top of the cathode frame is provided with a reflecting cup (with a reflecting and light-gathering function), the LED wafer (1) is fixed in the reflecting cup of the support (2) through insulating glue and the like, the above structures are packaged in the transparent light distribution inner lens (3), wherein electrode pins at the lower parts of the anode frame and the cathode frame respectively extend out of the transparent light distribution inner lens (3) (can be common to negative or common to positive when multiple chips),

the top of the light distribution inner lens (3) is an optical part with a light distribution emitting function, the outer side wall of the light distribution inner lens (3) is also combined with a long afterglow luminescent lens body (4) (generally formed by glue dripping or injection curing through a mold), the long afterglow luminescent lens body (4) is an optical structure luminescent forming body formed by mixing long afterglow luminescent powder and a light transmission mixed medium in proportion and forming through liquid curing or molten state curing, and the long afterglow luminescent lens body (4) is surrounded or partially surrounded on the side wall of the light distribution inner lens (3) through a transparent light guide medium in a liquid curing mode (preferably adopting a secondary glue dripping process) or a molten state curing mode or a fitting structure to form an LED whole body with LED light distribution emitting and afterglow luminescent functions;

when the LED wafer (1) emits light, as shown in fig. 1, part of the light close to the main axis of light emission keeps the original light spectrum to emit according to the emission light field distribution requirement required to be met, when the top of the special light distribution inner lens (3) is provided with the light gathering head, part of the light close to the main axis of light emission keeps the original light spectrum to emit in the direction of the light gathering head in a light gathering way, meanwhile, part of the light far away from the main axis of light emission is emitted to the long afterglow light emitting lens body (4) and is excited, and the brightness of the long afterglow excited light is far lower than that of the LED emitted light in the direction of the main axis of light emission, so that the LED wafer has a better afterglow emission effect;

when the LED chip (1) is turned off, as shown in fig. 6, the long afterglow luminescent lens body (4) keeps afterglow luminescence in a brightness decay mode and produces an afterglow brightening effect of superimposed luminescence mainly at its neighboring portion (generally in the surrounding area of the long afterglow luminescent lens body).

Furthermore, a long afterglow luminous lens body (4) is arranged around the outer side of the inner lens (3) of the light distribution, and a transparent outer lens (5) (which can be formed in a grading manner) is arranged on the outer side of the long afterglow luminous lens body (4) to protect and guide the LED.

Furthermore, an optical part at the top of the light distribution inner lens (3) is a light-gathering optical structure (also called a light-gathering head), so that the long-afterglow LED with the light-gathering function and the afterglow light-emitting function of the LED emergent light along the light-emitting main axis direction is formed. (the side surface or the bottom surface of the long afterglow luminous lens body upwards passes through the light distribution inner lens (3) and is condensed and luminous through the condensing optical structure (light condensing head))

Furthermore, the optical part at the top of the light distribution inner lens (3) is of a light scattering optical structure, so that the long afterglow LED with the LED emergent light diverging function and the afterglow light emitting function along the light emitting main axis direction is formed.

Furthermore, an optical part at the top of the light distribution inner lens (3) is of a polarized light optical structure, so that the long-afterglow LED with the polarized light function and the afterglow light emitting function is formed, wherein the LED emergent light and the light emitting main shaft direction form a certain angle.

Furthermore, an optical part at the top of the light distribution inner lens (3) is of a polarizing optical structure, so that the long-afterglow LED with the functions of emitting LED emergent light mainly along one side polarized light and emitting afterglow light is formed.

Further, the long afterglow light emitting lens body (4) is a surrounding structure [ as shown in fig. 11, the side portion of the lens (3) within the light distribution is fully surrounded by the long afterglow light emitting lens body (4) ], and the outer contour of the long afterglow light emitting lens body (4) is circular (as shown in fig. 14), elliptical, polygonal (as shown in fig. 15, square or hexagonal as shown in fig. 16) or a combination of the above shapes in plan view.

Further, the long afterglow luminescent lens body (4) is SrAl₂O₄Long persistence luminous powder or Sr₄Al₁₄O₂₅The long-afterglow luminescent lens body (4) is a mixed solidified product of yellow-green or blue-green aluminate long-afterglow luminescent powder represented by type long-afterglow luminescent powder, or red or near-red long-afterglow luminescent powder represented by sulfide or nitride and a liquid or molten transparent mixed medium, or the particle size of the long-afterglow luminescent powder of the long-afterglow luminescent lens body (4) is between 1 and 200 mu m (both ends are included in the long-afterglow luminescent lens body), or the proportion of the long-afterglow luminescent powder in the long-afterglow luminescent lens body (4) is between 20 and 60 percent, or the thickness of the long-afterglow luminescent lens body (4) is between 1.5 and 10 mm.

Furthermore, the light distribution inner lens (3) is made of epoxy resin, PC, acrylic, PMMA, PS or glass.

Further, the bottom (or bottom) of the long afterglow luminescent lens body (4) is an enclosure (preferably an annular ring) with a through hole cavity or a slot (for inserting and punching), and the enclosure is provided with an upright long afterglow connecting bracket which is combined on the side wall of the light distribution inner lens (3) in a manner of single side, opposite two sides (as shown in fig. 12) or radial shape in a top view (as shown in fig. 13) [ the side part of the light distribution inner lens (3) is partially surrounded by the long afterglow luminescent lens body (4) ].

Further, the long afterglow light emitting lens body (4) has a symmetrical structure or an asymmetrical structure with the LED light emitting center (the position where the LED chip is located) as the center.

Further, as shown in fig. 12 and 13, the arrangement surface where the electrode pins of the bracket (2) are located passes through the light-emitting center of the light distribution inner lens (3), and the long afterglow light-emitting lens body (4) is arranged on one side or both sides of the arrangement surface, which is beneficial to space layout, production and manufacture, improvement of light-emitting effect and angle turnover in the later use process.

Furthermore, the size of a vertical excitation angle (theta 1) of the long afterglow light emitting lens body (4) in the LED wafer (1) along the central vertical section of the lens (3) in the light distribution is between 0 and 75 degrees, or the size of a horizontal excitation angle (theta 2) of the long afterglow light emitting lens body (4) in the LED wafer (1) along the bottom surface of the lens (3) in the light distribution is between 90 and 180 degrees (beneficial to light energy distribution).

Further, the height of at least one part of the long afterglow luminous lens body (4) is not lower than the height of the lowest position of the LED chip (1) in the emergent process, and preferably, the height of the bottom of the long afterglow luminous lens body (4) is not lower than the height of the lowest position of the LED chip (1) in the emergent process.

Furthermore, a transparent light guide mixed medium (silica gel or epoxy resin) mixed with one or more LED fluorescent powders is filled above the LED wafer (1) in the reflecting cup bowl, so that light conversion is facilitated, and for example, blue light and YAG yellow powder are changed into white light.

Further, two or more LED chips (1) are arranged in the reflective cup bowl of the support (2), and at least one of the LED chips is not in the long afterglow excitation spectrum, and at least one of the LED chips is in the long afterglow excitation spectrum, wherein each LED chip is arranged by using a common cathode or a common anode (as shown in fig. 9), or the cathode and the anode are arranged separately (as shown in fig. 10), so as to achieve the effect of multi-color light emission.

Further, the LED wafer (1) is at least two or more than two chips (UV + LED wafer) of an ultraviolet chip and a conventional visible light chip, can excite long afterglow and has conventional light emitting application.

Furthermore, the light distribution inner lens (3) is circular or polygonal in plan view, and the long afterglow light emitting lens body (4) is arranged at the outer side of the light distribution inner lens (3); or the conjoined structure of the light distribution inner lens (3) and the long afterglow luminous lens body (4) is circular or polygonal in plan view.

Furthermore, the top of the light distribution inner lens (3) is integrally raised, and the top surface of the light distribution inner lens is a free-form light-gathering surface.

Furthermore, the top of the inner lens (3) for light distribution is wholly raised, and the center of the top surface is downwards sunken.

Furthermore, the top surface of the top of the light distribution inner lens (3) is an inclined plane with a certain inclination angle or a free curved surface with a certain inclination angle and a convex central part.

Further, the long afterglow luminescent lens body (4) is arranged on the opposite side of the polarized light emergent side.

LED wafer (1):

the LED chip (1) at least comprises one LED chip on the long afterglow excitation spectrum, or comprises two or more LED chips, wherein at least one LED chip not on the long afterglow excitation spectrum, and each LED chip adopts a common cathode, a common anode or a cathode and an anode which are arranged separately.

Support (2):

support (2) are equipped with LED wafer (1) [ (general) including positive pole frame and negative pole frame, positive pole frame or negative pole frame, and the top of positive pole frame or the top of negative pole frame are equipped with reflection bowl cup (have reflection spotlight function), LED wafer (1) fix in the reflection cup bowl of support (2) through insulating cement etc. ], above-mentioned structural package is in the inside of lens (3) in the transparent grading, wherein, the electrode pin of positive pole frame and negative pole frame lower part extends respectively outside lens (3) in the transparent grading (can be totally negative or totally positive when the multicore piece).

Light distribution inner lens (3):

the inner lens (3) for light distribution is made of transparent materials, such as transparent PC, PMMA or transparent epoxy resin, and injection molding is adopted. The molding process such as pouring and the like mainly plays the roles of light transmission, light distribution, protection, support, coating, accommodation, fixation, circuit connection, installation and the like, and can distribute the light energy ratio of the emergent light part of the LED luminous body and the exciting light part for exciting long-afterglow luminescence and the light distribution emergent function of the LED according to the design requirement.

Long persistence light emitting lens body (4):

the long afterglow luminescent lens body (4) is long afterglow luminescent powder (generally SrAl)₂O₄Long persistence luminous powder or Sr₄Al₁₄O₂₅Yellow green or blue green aluminate long afterglow luminescent powder represented by type long afterglow luminescent powder, or red series or near red series long afterglow luminescent powder represented by sulfide or nitride) and a light-transmitting mixed medium (such as transparent epoxy glue) are mixed in proportion and are surrounded or partially surrounded on the side wall of the light distribution inner lens (3) in a liquid curing mode or a molten state curing mode through a liquid state curing molding or molten state curing molding annular surrounding structure or a side wall structure with an annular bottom, and the transparent light guide medium is surrounded or partially surrounded on the side wall of the light distribution inner lens (3) in a mode of being parallel to or vertical to the bottom surface of the LED in a liquid state curing mode or a molten state curing mode or a fit structure combination mode.

The long afterglow LED of the invention has the main advantages that:

the long afterglow luminous body has the advantages that the ratio of the light energy of the emergent light part of the long afterglow LED to the light energy of the exciting light part for exciting the long afterglow luminescence can be distributed according to the design requirement, the light energy utilization rate is high, the long afterglow luminous body has the LED light distribution emergent function and the integral long afterglow luminous effect with high brightness, the LED is condensed and emitted in the main light emitting shaft direction in the natural color (the original luminous performance and the original luminous wavelength) while the afterglow luminescence of the long afterglow luminous body is kept, the purpose of directional light projection can be realized, the light interference (chromaticity shift and the like) caused by the long afterglow excited light to the LED is reduced, the luminous effect (the LED luminous effect and the long afterglow luminous effect) or the light distribution emergent effect is good, and particularly, various other advantages can be brought, the afterglow brightening effect of overlapping luminescence at the adjacent part of the long afterglow when the long afterglow luminescence; especially when a multi-chip LED or a single LED emits multi-color light, the color light which is not in the long afterglow excitation spectrum range is not influenced by the shading of the long afterglow luminous body; the LED fluorescent lamp has the advantages of higher light energy utilization rate, better universality, more excellent light emitting performance, higher integration level and standardization level, high convenience degree and wider applicability.

Drawings

FIG. 1 is a schematic diagram of a cross-sectional structure A1-A1 and a light distribution of a long afterglow LED with a light gathering optical structure;

FIG. 2 is a schematic perspective structural view of a long persistence LED with a condensing optical structure;

FIG. 3 is a schematic sectional view of the long persistence LED A2-A2 with a light gathering optical structure;

FIG. 4 is a schematic diagram of LED light energy distribution;

FIG. 5 is a schematic diagram of the distribution of light energy of an LED with a long persistence LED having a light gathering optical structure;

FIG. 6 is a schematic diagram of afterglow luminescence of a long afterglow LED with a light gathering optical structure;

FIG. 7 is a schematic cross-sectional view of a long persistence LED with a light gathering optical structure;

FIG. 8 is a schematic cross-sectional view of a long persistence LED with a light gathering optical structure;

FIG. 9 is a schematic cross-sectional view of a long persistence LED with multiple chips individually configured with cathode and anode leads with a light gathering optical configuration;

FIG. 10 is a schematic cross-sectional view of a long persistence LED with multiple chips having common cathode and common anode leads with a light gathering optical structure;

FIG. 11 is a schematic diagram of a top view of a fully-enclosed long-afterglow LED with a light-gathering optical structure;

FIG. 12 is a schematic top view of a two-petal long-afterglow LED with a light-gathering optical structure;

FIG. 13 is a schematic top view of a plum blossom type long persistence LED with a light gathering optical structure;

FIG. 14 is a schematic top view diagram of a circular long persistence LED with a light gathering optical structure;

FIG. 15 is a schematic top view diagram of a square long persistence LED with collection optics;

FIG. 16 is a schematic diagram of a top view of a hexagonal long persistence LED with collection optics;

FIG. 17 is a schematic diagram illustrating a perspective view of a long persistence LED with a condensing optical structure according to an embodiment;

FIG. 18 is a schematic diagram illustrating a cross-sectional structure and light distribution of A3-A3 of a long persistence LED with a light gathering optical structure according to a first embodiment;

FIG. 19 is a schematic cross-sectional view of the long persistence LED at A4-A4 with a concentrating optic configuration according to a first embodiment;

FIG. 20 is a schematic diagram of afterglow emission of a long afterglow LED having a light collecting optical structure according to a first embodiment;

fig. 21 is a schematic cross-sectional structure and light distribution diagram of a long-afterglow LED with a light diverging optical structure according to a second embodiment;

FIG. 22 is a schematic diagram showing a cross-sectional structure and a light distribution of a long persistence LED with a polarized light optical structure according to a third embodiment;

fig. 23 is a schematic diagram illustrating a cross-sectional structure and a light distribution of a long-afterglow LED with a polarizing optical structure according to a fourth embodiment;

fig. 24 is a schematic top view of a long-afterglow LED having a polarizing optical structure according to a fourth embodiment.

Detailed Description

Based on the spirit of the present invention, the embodiment herein is only a typical example of the straw hat lamp bead, but not limited to the embodiment herein, and the embodiment of the present invention is described below with reference to the accompanying drawings.

Example one

A long persistence LED with concentrating optics, as shown in fig. 17-20, comprising: LED wafer (110) and annex, support (120), grading inner lens (130), long afterglow luminescence lens body (140), grading inner lens (130) for two ingredient transparent epoxy through the transparent optical lens of technologies such as pouring solidification shaping, whole be similar cylindrically, its top is the spherical segment shape spotlight structure, support (120) are wedge support, including anode rod and the cathode rod that the top has the transmission bowl, its lower part is the electrode pin, LED wafer (110) are fixed in the reflection cup bowl of support (120) through insulating cement, the rethread crystal line (or annex) link to each other with the electrode pin, support (120) grading inner lens (130) two ingredient transparent epoxy insert its inside until its solidification when not solidifying.

Two or more LED chips may be used, and when at least one LED chip is not in the long afterglow excitation spectrum and at least one LED chip is in the long afterglow excitation spectrum, each LED chip may be provided with a common cathode, a common anode, or a cathode and an anode separately. Not obscured when multispectral. "C (B)

Then the encapsulated light distribution inner lens (130) is inversely inserted into a mould filled with mixed slurry of long afterglow luminescent powder and transparent epoxy resin for secondary curing molding, and then demoulding is carried out;

or the long afterglow luminescent powder and the transparent acrylic resin are molded by injection molding process, and can be in an annular (cylindrical) surrounding structure, are combined on the side periphery of the light distribution inner lens (130) through a fitting structure and transparent light guide glue (the periphery of the light distribution inner lens (130) is fully surrounded in 360 degrees in overlooking), or are side walls or supports with a surrounding ring at the bottom, such as two opposite surrounding shells with the surrounding ring at the bottom, and are embedded on the light distribution inner lens (130) from top to bottom or from bottom to top through the fitting structure and are solidified and combined into an integral structure through the transparent light guide medium (130) at the combination part of the two in a glue dipping or glue dripping mode by using the liquid transparent light guide medium (130).

Furthermore, the outer surface of the light distribution inner lens (130) or the long afterglow light emitting lens body (140) can be soaked with gelatin and solidified into a light transmitting protective layer.

As shown in fig. 18, when the long persistence LED is powered on, a part of light emitted from the LED chip (110) is condensed and emitted from the top of the LED along the light-emitting main axis with the original spectral characteristics, and a part of light is also deflected from the light-emitting main axis and emitted to the side of the LED to be excited on the long persistence light-emitting lens (140), wherein the LED chip (110) can emit blue light or UV short wave to facilitate excitation of long persistence represented by alkaline earth aluminate, at this time, corresponding phosphor powder can be disposed in the reflective cup, and the light emitted from the LED chip (110) and the excited light of the phosphor powder are mixed to be white light, which is beneficial for being used in the fields of illumination and the like; or RGB multi-chip can be adopted, wherein the short-wave chip is used for exciting long afterglow, and the whole mixed light is white.

As shown in fig. 20, the power-off long afterglow luminescent lens body (140) glows with afterglow outwards, and part of the light can be reflected or refracted inside the light distribution inner lens (130) to realize superposition luminescence, so as to achieve the effect of afterglow brightening.

The long-afterglow LED has high light energy utilization rate, keeps the afterglow luminescence of a long-afterglow luminophor, enables the LED to condense and emit light in the main light emitting shaft direction by the natural color (the original luminescence property and the luminescence wavelength), can realize the aim of directional light projection, reduces the light interference (chromaticity shift and the like) caused by the luminescence of the LED when the long-afterglow is excited by light, has the whole long-afterglow luminescence effect of high brightness, can be used as a point light source independently, or can be used as a luminescence component to be combined with other luminescence components to be made into various luminescence devices, and has wide application range.

Example two

A long persistence LED with light diverging optical structure, as shown in fig. 21, comprising: the LED light source comprises an LED wafer (210), accessories, a support (220), a light distribution inner lens (230) and a long-afterglow light-emitting lens body (240), wherein the light distribution inner lens (230) is a transparent optical lens formed by curing two-component transparent epoxy resin through casting and other processes, the whole body is in a cylinder shape, the whole top of the transparent optical lens is upwards raised, and the central part of the top is downwards recessed to form a light divergence structure. The support (220) is a wedge-shaped support and comprises an anode rod and a cathode rod, the top of the cathode rod is provided with a transmitting bowl, the lower portion of the cathode rod is provided with an electrode pin, the LED wafer (210) is fixed in the reflecting cup bowl of the support (220) through insulating glue and then connected with the electrode pin through a crystal wire (or an accessory), and the support (220) is inserted into the double-component transparent epoxy resin of the light distribution inner lens (230) until the double-component transparent epoxy resin is cured when the double-component transparent epoxy resin is uncured.

Then the encapsulated light distribution inner lens (230) is inversely inserted into a mould filled with mixed slurry of long afterglow luminescent powder and transparent epoxy resin for secondary curing molding, and then demoulding is carried out;

or the long afterglow luminescent powder and the transparent acrylic resin are molded by injection molding process, and can be in an annular (cylindrical) surrounding structure, and are combined on the side periphery of the light distribution inner lens (230) through a fitting structure and transparent light guide glue (the periphery of the light distribution inner lens (230) is fully surrounded in 360 degrees in overlooking), or a side periphery or a support with a surrounding ring at the bottom, such as two opposite surrounding shells with the surrounding ring at the bottom, and are embedded on the light distribution inner lens (230) from top to bottom or from bottom to top through the fitting structure and are solidified and combined into an integral structure by a liquid transparent light guide medium (230) in a glue dipping or glue dripping mode.

Furthermore, gelatin can be soaked and cured on the outer surface of the light distribution inner lens (230) or the long afterglow light emitting lens body (240) to form a light transmitting protective layer.

As shown in fig. 21, when the long afterglow LED is powered on, part of the light emitted from the LED chip (210) is condensed and emitted from the top of the LED along the light emitting main axis with the original spectral characteristics, and part of the light is also deflected from the light emitting main axis and emitted to the side of the LED to be excited on the long afterglow light emitting lens body (240), wherein the LED chip (210) can emit blue light or UV short wave to facilitate excitation of long afterglow represented by alkaline earth aluminate, at this time, corresponding phosphor powder can be disposed in the reflective cup, and the light emitted from the LED chip (210) and the excited light of the phosphor powder are mixed to be white light, which is beneficial for being used in the fields of illumination and the like; or RGB multi-chip can be adopted, wherein the short-wave chip is used for exciting long afterglow, and the whole mixed light is white.

The long afterglow luminous lens body (240) emits light towards the external afterglow during power failure, and part of the light can be reflected or refracted inside the light distribution inner lens (230) to realize superposition luminescence, so that the effect of afterglow brightening is achieved.

The long-afterglow LED has high light energy utilization rate, keeps the afterglow luminescence of a long-afterglow luminous body, simultaneously leads the LED to be emitted in the direction of a main light emitting shaft in the natural color (the original luminescence property and the luminescence wavelength) in a divergent mode, can realize the aim of directional light projection, reduces the light interference (chromaticity shift and the like) caused by the luminescence of the LED when the long-afterglow is excited to light, has the integral long-afterglow luminescence effect of high brightness, can be used as a point light source independently, or can be used as a luminescence component to be combined with other luminescence components to be made into various luminescence devices, and has wide application range.

EXAMPLE III

A long persistence LED with a biased optical structure, as shown in fig. 22, comprising: the LED light source comprises an LED wafer (310), accessories, a support (320), a light distribution inner lens (330) and a long-afterglow light-emitting lens body (340), wherein the light distribution inner lens (330) is a transparent optical lens formed by curing two-component transparent epoxy resin through processes such as pouring and the like, the whole body is in a cylindrical shape, and the top of the light distribution inner lens is an inclined plane with a certain inclination angle to form a polarized light optical structure. The support (320) is a wedge-shaped support and comprises an anode rod and a cathode rod, the top of the cathode rod is provided with a transmitting bowl, the lower portion of the cathode rod is provided with an electrode pin, the LED wafer (310) is fixed in the reflecting cup bowl of the support (320) through insulating glue and then connected with the electrode pin through a crystal wire (or an accessory), and the support (320) is inserted into the double-component transparent epoxy resin of the light distribution inner lens (330) until the double-component transparent epoxy resin is cured when the double-component transparent epoxy resin is uncured.

Then the encapsulated light distribution inner lens (330) is inversely inserted into a mould filled with mixed slurry of long afterglow luminescent powder and transparent epoxy resin for secondary curing molding, and then demoulding is carried out;

or the long afterglow luminescent powder and the transparent acrylic resin are molded by injection molding process, and can be in an annular (cylindrical) surrounding structure, and are combined on the side periphery of the light distribution inner lens (330) through a matching structure and transparent light guide glue (the light distribution inner lens (330) is fully surrounded by 360 degrees in overlooking), or a side wall or a support with a surrounding ring at the bottom, for example, two opposite surrounding shells with the surrounding ring at the bottom are embedded on the light distribution inner lens (330) from top to bottom through the matching structure and are solidified and combined into an integral structure by a liquid transparent light guide medium (330) in a glue dipping or glue dripping mode, and at the moment, the direction of the two surrounding shells is consistent with the inclined direction of the top surface of the light distribution inner lens (330).

Furthermore, gelatin can be soaked and cured on the outer surface of the light distribution inner lens (330) or the long afterglow light emitting lens body (340) to form a light transmitting protective layer.

As shown in fig. 22, when the long afterglow LED is powered on, part of the light emitted from the LED chip (310) is condensed and emitted from the top of the LED along the light emitting main axis with the original spectral characteristics, and part of the light is also deflected from the light emitting main axis and emitted to the side of the LED to be excited on the long afterglow light emitting lens body (340), wherein the LED chip (310) can emit blue light or UV short wave to facilitate excitation of long afterglow represented by alkaline earth aluminate, at this time, corresponding phosphor powder can be disposed in the reflective cup, and the light emitted from the LED chip (310) and the excited light of the phosphor powder are mixed to be white light, which is beneficial for being used in the fields of illumination and the like; or RGB multi-chip can be adopted, wherein the short-wave chip is used for exciting long afterglow, and the whole mixed light is white.

The long afterglow luminous lens body (340) emits light to the external afterglow during power failure, and part of the light can be reflected or refracted inside the light distribution inner lens (330) to realize superposition luminescence, so that the effect of afterglow brightening is achieved.

The long afterglow LED of the invention has high light energy utilization rate, ensures that the LED has a certain acute angle between the original color (the original luminous performance and the luminous wavelength) and the main luminous axis while maintaining the afterglow luminescence of the long afterglow luminophor, can realize the aim of directional light projection, reduces the light interference (chromaticity shift and the like) caused by the long afterglow excited light to the LED luminescence, has high-brightness long afterglow luminescence effect as a whole, can be used as a point light source alone or combined with other luminescence components as a luminescence component to be made into various luminescence devices, and has wide application range.

Example four

A long persistence LED with polarizing optical structure, as shown in fig. 23 and 24, includes: the LED light source comprises an LED wafer (410), accessories, a support (420), a light distribution inner lens (430) and a long-afterglow light-emitting lens body (440), wherein the light distribution inner lens (430) is a transparent optical lens formed by casting two-component transparent epoxy resin and curing through a process, the whole body is in a similar cylindrical shape, and one side of the top of the light distribution inner lens is a polarized optical structure which laterally condenses light towards the side. The support (420) is a wedge-shaped support and comprises an anode rod and a cathode rod, the top of the cathode rod is provided with an emission bowl, the lower portion of the cathode rod is provided with an electrode pin, the LED wafer (410) is fixed in the reflection cup bowl of the support (420) through insulating glue and then connected with the electrode pin through a crystal wire (or an accessory), and the support (420) is inserted into the double-component transparent epoxy resin of the light distribution inner lens (430) until the double-component transparent epoxy resin is cured when the double-component transparent epoxy resin is uncured.

Then the encapsulated light distribution inner lens (430) is inversely inserted into a mould filled with mixed slurry of the long afterglow luminescent powder and the transparent epoxy resin for secondary curing molding, and then demoulding is carried out;

or the long afterglow luminescent powder and the transparent acrylic resin are molded by injection molding process, can be a side wall or a bracket with a surrounding ring at the bottom, such as a single-petal surrounding shell with a surrounding ring at the bottom, are embedded on the light distribution inner lens (430) from top to bottom or from bottom to top through a fitting structure and are solidified and combined into an integral structure by a liquid transparent light guide medium (430) in a glue dipping or dripping mode, and the single-petal housing and the lateral condenser lens are arranged oppositely.

Furthermore, gelatin can be soaked and cured on the outer surface of the light distribution inner lens (430) or the long afterglow light emitting lens body (440) to form a light-transmitting protective layer.

As shown in fig. 23, when the long persistence LED is powered on, a part of light emitted from the LED chip (410) is condensed and emitted from the top of the LED along the light-emitting main axis with the original spectral characteristics, and a part of light is also deflected from the light-emitting main axis and emitted to the side of the LED to be excited on the long persistence light-emitting lens (440), wherein the LED chip (410) can emit blue light or UV short wave to facilitate excitation of long persistence represented by alkaline earth aluminate, at this time, corresponding phosphor powder can be disposed in the reflective cup, and the light emitted from the LED chip (410) and the excited light of the phosphor powder are mixed to be white light, which is beneficial for being used in the fields of illumination and the like; or RGB multi-chip can be adopted, wherein the short-wave chip is used for exciting long afterglow, and the whole mixed light is white.

The long afterglow luminous lens body (440) emits light to the external afterglow during power failure, and part of the light can be reflected or refracted inside the light distribution inner lens (430) to realize superposition luminescence, so that the effect of afterglow brightening is achieved.

The long-afterglow LED has high light energy utilization rate, enables the LED to emit light along one side of the long-afterglow light-emitting lens body in the natural color (the original light-emitting performance and the light-emitting wavelength) while maintaining the afterglow light emission of the long-afterglow light-emitting body, can realize the purpose of directional light projection, reduces the light interference (chromaticity shift and the like) caused by the long-afterglow excited light to the LED light emission, has the high-brightness long-afterglow light-emitting effect as a whole, can be used as a point light source to be used alone or combined with other light-emitting components to be made into various light-emitting devices, and has wide application range.

The invention is not to be considered as limited to the particular embodiments described herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. The utility model provides a long persistence LED, includes lens (3) in LED wafer (1) and annex, support (2), the grading, grading in lens (3) be transparent optical lens, support (2) including positive pole frame and negative pole frame, be equipped with LED wafer (1) and annex on positive pole frame or the negative pole frame, above-mentioned structural package is in the inside of lens (3) in the transparent grading, wherein, the electrode pin of positive pole frame and negative pole frame lower part extends to in the transparent grading respectively outside lens (3), its characterized in that: the outer side wall of the light distribution inner lens (3) is also combined with a long afterglow luminescent lens body (4), the long afterglow luminescent lens body (4) is an optical structure luminescent forming body formed by mixing long afterglow luminescent powder and a light-transmitting mixed medium in proportion and performing liquid curing forming or molten state curing forming, the long afterglow luminescent lens body (4) surrounds or partially surrounds the side wall of the light distribution inner lens (3) through a transparent light guide medium in a liquid curing mode or a molten state curing mode or a fit structure, and the top of the light distribution inner lens (3) is an optical part with a light distribution emergent function, so that an LED whole body with LED light distribution emergent and afterglow luminescent functions is formed.

2. The long persistence LED of claim 1, wherein: and a transparent outer lens (5) is arranged outside the long afterglow luminous lens body (4).

3. The long persistence LED of claim 1, wherein: the optical part at the top of the light distribution inner lens (3) is of a light-gathering optical structure.

4. The long persistence LED of claim 1, wherein: the optical part at the top of the light distribution inner lens (3) is of a light scattering optical structure.

5. The long persistence LED of claim 1, wherein: the optical part at the top of the light distribution inner lens (3) is of a polarized light optical structure.

6. The long persistence LED of claim 1, wherein: the optical part at the top of the light distribution inner lens (3) is a polarized optical structure.

7. The long persistence LED of claim 1, wherein: the long afterglow luminous lens body (4) is SrAl₂O₄Long persistence luminous powder or Sr₄Al₁₄O₂₅The long-afterglow luminescent lens is a mixed solidified product of yellow-green or blue-green aluminate long-afterglow luminescent powder represented by type long-afterglow luminescent powder, or red or near-red long-afterglow luminescent powder represented by sulfide or nitride and a liquid or molten transparent mixed medium, or the particle size of the long-afterglow luminescent powder of the long-afterglow luminescent lens body (4) is between 1 and 200 mu m, or the proportion of the long-afterglow luminescent powder in the long-afterglow luminescent lens body (4) is between 20 and 60 percent, or the thickness of the long-afterglow luminescent lens body (4) is between 1.5 and 10 mm.

8. The long persistence LED of claim 1, wherein: the inner lens (3) is made of epoxy resin, PC, acrylic, PMMA or PS.

9. The long persistence LED of claim 1, wherein: the long afterglow luminous lens body (4) is of a surrounding structure, and the outer contour of the long afterglow luminous lens body (4) is circular, elliptical, polygonal or the combination of the shapes in plan view.

10. The long persistence LED of claim 1, wherein: the bottom of the long afterglow luminous lens body (4) is an enclosure with a through hole cavity or a through groove in the middle, an upright long afterglow conjoined support is arranged on the enclosure, and the enclosure is arranged on the side wall of the inner lens (3) in a radial mode in a unilateral, opposite two sides or overlooking mode.

11. The long persistence LED of claim 1, wherein: the long afterglow luminous lens body (4) is of a symmetrical structure or an asymmetrical structure taking a luminous center as a center.

12. The long persistence LED of claim 1, wherein: the arrangement surface where the electrode pins of the support (2) are located passes through the light-emitting center of the light distribution inner lens (3), and the long-afterglow light-emitting lens body (4) is arranged on one side or two sides of the arrangement surface.

13. The long persistence LED of claim 1, wherein: the size of a vertical excitation angle (theta 1) of the long afterglow light emitting lens body (4) in the central vertical section of the LED chip (1) along the light distribution inner lens (3) is between 0 DEG and 75 DEG, or the size of a horizontal excitation angle (theta 2) of the long afterglow light emitting lens body (4) in the LED chip (1) along the bottom surface of the light distribution inner lens (3) is between 90 DEG and 180 deg.

14. The long persistence LED of claim 1, wherein: the height of at least one part of the long afterglow luminous lens body (4) is not lower than the height of the lowest position of the emergent LED chip (1), or the height of the bottom of the long afterglow luminous lens body (4) is not lower than the height of the lowest position of the emergent LED chip (1).

15. The long persistence LED of claim 1, wherein: and a transparent light guide mixed medium mixed with one or more LED fluorescent powder is also filled above the LED wafer (1) in the reflecting cup bowl.

16. The long persistence LED of claim 1, wherein: two or more LED wafers (1) are arranged in a reflecting cup bowl of the bracket (2), at least one LED wafer is not on the long afterglow excitation spectrum, and at least one LED wafer is on the long afterglow excitation spectrum, and the LED wafers are arranged by adopting a common cathode or a common anode, or a cathode and an anode are independently arranged.

17. The long persistence LED of claim 1, wherein: the LED wafer (1) at least comprises an ultraviolet chip and a visible light chip.

18. The long persistence LED of claim 1, wherein: the light distribution inner lens (3) is circular or polygonal in plan view, and the long afterglow light emitting lens body (4) is arranged at the outer side of the light distribution inner lens (3); or the conjoined structure of the light distribution inner lens (3) and the long afterglow luminous lens body (4) is circular or polygonal in plan view.

19. The long persistence LED of claim 3, wherein: the top of the light distribution inner lens (3) is wholly raised upwards, and the top surface of the light distribution inner lens is a free-form light-gathering surface.

20. The long persistence LED of claim 4, wherein: the top of the light distribution inner lens (3) is wholly raised upwards, and the top surface of the light distribution inner lens is a divergent free-form surface with the center depressed downwards.

21. The long persistence LED of claim 5, wherein: the top surface of the top of the light distribution inner lens (3) is an inclined plane with a certain inclination angle or a free curved surface with a certain inclination angle and a convex central part.

22. The long persistence LED of claim 6, wherein: the long afterglow luminous lens body (4) is arranged on the opposite side of the top polarized light emergent side of the lens (3) in the light distribution.