61 results about "Solid-state lighting" patented technology

Tailored doping of barrier layers enables balancing of the radiative recombination among the multiple-quantum-wells in III-Nitride light-emitting diodes. This tailored doping enables more symmetric carrier transport and uniform carrier distribution which help to reduce electron leakage and thus reduce the efficiency droop in high-power III-Nitride LEDs. Mitigation of the efficiency droop in III-Nitride LEDs may enable the pervasive market penetration of solid-state-lighting technologies in high-power lighting and illumination.

Solid-state lighting devices including light-emitting diodes (LEDs) and more particularly structures for LED packages with multiple LED chips are disclosed. LED package structures include arrangements of one or more of body structures with multiple cavities for LED chips, encapsulants with lenses registered with the multiple cavities, and lead frame structures at least partially within the body structures. Cavities of body structures and / or corresponding lenses are disclosed with certain asymmetries configured to direct highest intensities of LED chip emissions in directions that are offset from cavity centers. Body structures are disclosed with one or more continuously planar surfaces that promote enhanced flexibility in encapsulant and / or lead frame structures and improved resistance to moisture ingress. One or more combinations of cavities and / or lenses asymmetries may be implemented in combination with one or more continuously planar body surfaces.

Solid-state lighting devices including light-emitting diodes (LEDs) and more particularly contact structures in LED chips for reducing voiding of bonding metals are disclosed. LED chips include active LED structures on carrier submounts and contact structures arranged to receive external electrical connections adjacent the active LED structures. Exemplary contact structures include contacts electrically coupled to active LED structures and dielectric structures beneath the contacts. Dielectric structures are arranged beneath portions of the contacts while still allowing electrical connections therethrough. Such dielectric structures may be provided as regions of dielectric material with spacings that control topography of underlying bonding metals to reduce voiding.

The invention discloses an NCS-doped manganese-based organic-inorganic hybrid metal halide luminescent material and a preparation method thereof, and belongs to the field of photoelectric materials. The chemical formula of the manganese-based organic-inorganic hybrid metal halide is (C12H28N) 2MnBr4: NCS-, and the manganese-based organic-inorganic hybrid metal halide can emit broadband bright yellow light with the central wavelength of 552 nm under the excitation of ultraviolet light. In addition, the preparation method of the luminescent material is simple and easy to operate, raw materials are cheap and easy to obtain, and the luminescent material is suitable for large-scale production. The luminescent material can be used in the fields of solid-state illumination, display and the like.

A vertical solid state lighting (SSL) device is disclosed. In one embodiment, the SSL device includes a light emitting structure formed on a growth substrate. Individual SSL devices can include a embedded contact formed on the light emitting structure and a metal substrate plated at a side at least proximate to the embedded contact. The plated substrate has a sufficient thickness to support the light emitting structure without bowing.

This invention proposes a high-performance perovskite quantum dot light-emitting diode (LED) based on carbazole-phosphonic acid and its derivatives, and its fabrication method. The perovskite quantum dot emitting layer and / or hole functional layer incorporate an interface modification material with a carbazole-phosphonic acid structure as the core functional layer. The resulting LED device comprises an ITO anode, a lithium fluoride interface buffer layer, a zinc oxide electron transport layer, and a metal cathode. This invention utilizes a one-step solution-blending spin-coating method to prepare a modified functional layer with surface passivation and a microscopic PN junction space charge region structure. It also demonstrates a device fabrication method using commercially available MeO-2PACz materials to replace PEDOT:PSS. The device exhibits stable and efficient structure, high bandgap matching, and the fabricated perovskite quantum dot LED demonstrates high brightness, significantly suppressed efficiency roll-off, and excellent high-current operating stability, showing great application potential in large-area displays and solid-state lighting.

Solid-state lighting devices including light-emitting diodes (LEDs) and more particularly arrangements of lumiphoric materials within LEDs and related methods are disclosed. Lumiphoric materials are incorporated or otherwise embedded within LED chips and LED wafers. Embedded lumiphoric materials are provided so that at least some portions of light generated by active LED structures are subject to wavelength conversion before exiting LED chip surfaces. Lumiphoric material layers include arrangements of lumiphoric particles and binder layers positioned between reflective layers and active LED structures. Lumiphoric material layers and / or lumiphoric particles may be patterned within regions of LED chips and / or LED wafers. Related methods include depositing lumiphoric particles and binder layers before reflective layers in LED chips and LED wafers.

Solid-state lighting devices including light-emitting diodes (LEDs) and more particularly structures for LED packages with multiple LED chips are disclosed. LED package structures include arrangements of one or more of body structures with multiple cavities for LED chips, encapsulants with lenses registered with the multiple cavities, and lead frame structures at least partially within the body structures. Cavities of body structures and / or corresponding lenses are disclosed with certain asymmetries configured to direct highest intensities of LED chip emissions in directions that are offset from cavity centers. Body structures are disclosed with one or more continuously planar surfaces that promote enhanced flexibility in encapsulant and / or lead frame structures and improved resistance to moisture ingress. One or more combinations of cavities and / or lenses asymmetries may be implemented in combination with one or more continuously planar body surfaces.

A solid state lighting device including a light emitting diode (LED) is disclosed, and more particularly, a structure of an LED package having a plurality of LED chips is disclosed. The LED package structure includes an arrangement of one or more of a body structure having a plurality of cavities for LED chips, an encapsulation having a lens in registration with the plurality of cavities, and a lead frame structure at least partially located within the body structure. Cavities having a body structure and / or corresponding lenses with certain asymmetries configured to direct the highest intensity emitted by the LED chip to a direction offset from the center of the cavity are disclosed. A body structure is disclosed having one or more continuous flat surfaces that improve enhanced flexibility of the encapsulant and / or leadframe structure, as well as improved resistance to moisture intrusion. One or more combinations of cavity and / or lens asymmetry may be implemented in conjunction with one or more continuous flat body surfaces.

Solid-state lighting devices including light-emitting diodes (LEDs) and more particularly LED chip structures and related methods are disclosed. LED chip structures include arrangements of current spreading layers and dielectric reflective layers relative to active LED structures. Current spreading layers may be positioned to provide electron path steering toward bulk portions of active LED structures and away from associated mesa sidewalls. Dielectric reflective layers may cover current spreading layers while also extending to cover the mesa sidewalls. Dielectric reflective layers include etch stop layers followed by one or more dielectric layers. The etch stop layers allow over-etching of the dielectric layers to ensure integrity of openings for various electrical interconnects formed through the dielectric reflective layer in related methods. Arrangements of electrical interconnects are also provided that provide tailored current balancing for LED chips.

A lighting circuit for solid-state lighting, such as light-emitting diodes (LEDs), is configured to produce reduced visible flicker. The lighting circuit may accept time-varying input power, such as alternating current (AC) power or rectified AC power. Within the circuit, a plurality of LED light engines are grouped in sets. Some of the sets receive unaltered input power, while other sets receive input power that has been shifted in phase. The phases of the sets of LED light engines are coordinated such that, at any time during the power cycle, at least one set of LED light engines is illuminated, and the lighting circuit as a whole produces a substantially constant luminous flux over the entire power cycle. LED light engines from different sets may be grouped or clustered together on a printed circuit board such that, in the aggregate, they do not produce the illusion of movement during illumination.

A solid-state lighting fixture assembly having a lighting fixture with a socket configured to receive a plug associated with one or more accessories to allow for easy in-field mounting of accessories, e.g., controls, onto installed lighting fixtures. The socket may be internally electrically connected to an auxiliary power output of a driver and / or to a battery power pack within the lighting fixture assembly, thereby providing direct-current voltage power for the accessory and, also, allowing for signal transmission to and from the accessory. Each accessory includes one or more sensors and communication components to provide the connected lighting fixture assembly with specific capabilities including, but not limited to, motion detection, ambient light level detection, ambient temperature measurement and wireless communications. The wireless communication can also be used to control one or a group of lighting fixtures and transmit sensor data associated with, for example, monitoring space utilization and asset tracking.

Solid-state lighting devices including light-emitting diodes (LEDs) and more particularly LED packages for environmental indication are disclosed. LED packages include one or more LED chips and reactive materials that preferentially react with environmental ingress. After sufficient reactant exposure, the reactive materials may degrade and exhibit reduced electrical conductivity. Reactive material arrangements relative to electrical connections are provided so that the one or more LED chips either turn on, turn off, or lose brightness to provide visual indication of environmental reactants. Reactive materials may form electrical shorting paths that bypass one or more LED chips until sufficient reactant exposure when the shorting paths fail and the one or more LED chips are electrically activated. Alternatively, reactive materials may form parts of electrically conductive paths for the one or more LED chips such that with sufficient reactant exposure, the electrically conductive paths fail and the one or more LED chips are electrically deactivated.

Solid-state lighting devices including light-emitting diodes (LEDs), and more particularly LED packages are disclosed. Arrangements for LED packages are disclosed that provide improved reliability and improved emission characteristics in a variety of applications, including outdoor LED displays as well as general illumination. LED packages are disclosed with linear arrangements of LED chips and corresponding lenses to provide improved visibility and color mixing at higher viewing angles. LED packages are disclosed that include different types of lenses that are arranged within the same LED package depending on desired emission characteristics. Body structures for LED packages are disclosed that include arrangements for improved adhesion with encapsulant materials and optional potting materials to provide improved moisture barriers.

The invention relates to a perovskite composite material as well as a preparation method and application thereof. The perovskite composite material comprises APTES modified lead halide perovskite nanocrystals and organic-inorganic hybrid perovskite glass, the APTES modified lead halide perovskite nanocrystal is completely encapsulated in the organic-inorganic hybrid perovskite glass, and the APTES modified lead halide perovskite nanocrystal is formed by the organic-inorganic hybrid perovskite glass and the inorganic-organic hybrid perovskite glass. The organic-inorganic hybrid perovskite glass comprises (TPnA) M (dca) 3 and Li (C2N3). According to the invention, pre-stabilization treatment is realized by modifying lead halide perovskite nanocrystals by using APTES, then Li (C2N3) is introduced to realize low-temperature fusion packaging of organic-inorganic hybrid perovskite glass on the nanocrystals, and under the synergistic effect of the two, the composite material with high luminescence property and high stability is obtained. The perovskite composite material containing CsPbBr3 can be used as a green light conversion layer to be integrated with commercial red powder and a blue light chip into a WLED device, and has a good application prospect in the fields of solid-state illumination and display.

The invention belongs to the technical field of luminescent materials and solid-state lighting, and particularly discloses Ba2AlLaO5: Eu < 3 + > red-light fluorescent powder and a preparation method thereof. The fluorescent powder can be effectively excited in a near ultraviolet / purple light wave band to generate red light for emission, and belongs to transition from 5D0 to 7FJ (J = 0-4) of Eu < 3 + >; gd < 3 + > does not directly emit light, but can sensitize Eu < 3 + > through non-radiative energy transfer, so that the emission intensity of red light (702 nm) is enhanced. The fluorescent powder has the advantages of being stable in structure, capable of being matched with a near ultraviolet / purple light LED chip, strong in dark red emission and the like, and is suitable for the fields of solid-state illumination, display and the like.

Solid-state lighting devices including light-emitting diodes (LEDs) and more particularly identification markers for LED packages and related methods are disclosed. Identification markers may include materials incorporated within LED packages that are transparent in a visible spectrum but detectable when illuminated with light outside the visible spectrum. When radiated with light outside the visible spectrum, identification markers may provide light in the visible spectrum. Alternatively, identification markers may provide light outside the visible spectrum that is detectable with equipment capable of detecting nonvisible light. Identification markers are generally configured to not be readily visible under inspection as a way to make LED packages more difficult for copying in counterfeit products.

Solid-state lighting devices including light-emitting diodes (LEDs) and more particularly reflective structures for LED chips and related methods are disclosed. Reflective structures include arrangements of a first metal and a second metal within a metal reflective layer. The second metal may have a nonuniform distribution throughout a thickness of the metal reflective layer relative to the first metal. The first metal may promote increased reflectivity relative to the second metal, and the second metal may promote increased mechanical stability, increased adhesion, and reduced electromigration. An exemplary metal reflective layer includes increased concentrations of the second metal near interfaces between the metal reflective layer and other layers of the LED chip. The second metal may also form concentration gradients in directions away from the interfaces. Related methods include sequentially forming discrete layers of the first and second metals, followed by annealing to form the metal reflective layer.

The invention discloses a preparation method and application of a transition metal ion doped CdSe / ZnS core-shell quantum dot, according to the method, transition metal ions are controllably introduced into a host CdSe / ZnS material forbidden band as a magazine energy level so as to create a new electron energy level, and meanwhile, the number of defect energy levels of the CdSe core quantum dot is remarkably reduced; and a light-emitting mechanism is successfully converted from band-edge exciton recombination to non-radiative transition recombination. And the dependence of the luminescence performance on the physical size of the quantum dot is eliminated. Due to the characteristic, the material has the excellent temperature response characteristic: the material has wide-spectrum and tunable luminescence, huge Stokes shift to eliminate self-absorption, excellent light stability and long fluorescence lifetime, and has the potential of low toxicity. Due to the advantages, the material has a huge application prospect in the fields of biological imaging, fluorescence detection, solid-state illumination and the like.

Solid-state lighting devices including light-emitting diode (LED) chips and more particularly interconnect structures for improved LED chip performance are disclosed. Interconnect structures are disclosed within LED chips that are structured to increase perimeter contact areas within localized LED chip areas without substantial increases to overall areas occupied by the interconnect structures. By increasing contact perimeters of interconnects within a certain area, increased current injection efficiency may be provided. Interconnect structures for increased current injection are disclosed for both n-type layers and p-type layers. Interconnect structures may include patterned dielectric materials within interconnect openings and corresponding interconnects that are formed around the patterned dielectric materials. Additional interconnect structures include nested patterns and extensions that provide enhanced adhesion along LED chip perimeters.

This invention provides a copper-iodine hybrid cluster compound having the structure shown in formula (I). Compared with the prior art, the copper-iodine hybrid cluster compound provided by this invention has excellent thermal stability, high fluorescence quantum yield, large Stokes shift, high solubility, strong absorption in the ultraviolet region, and a simple synthesis method. It meets the requirements of ideal transparent solar concentrator materials and ultraviolet shielding agents, and has broad application prospects in the field of building-integrated photovoltaics. In addition, it can also be applied to anti-counterfeiting coatings, solid-state lighting, X-ray imaging, and other fields.

1. Name of the designed product: Explosion-proof solid-state lighting lamp (HR-SEXL519). 2. Use of the designed product: The designed product is used for lighting in areas with explosive gases such as oil extraction and metallurgy. 3. Design points of the designed product: The shape. 4. Picture or photo that best indicates the design points: Perspective view 1.

Solid-state lighting devices and, more particularly, infrared (IR) re- emitting light-emitting diode (LED) packages (10, 42, 46,...) with filter structures (34, 34-1, 34-2,...) are disclosed. Filter structures include long-pass filters configured to pass wavelength-converted light (32) while reflecting light (30) from underlying LED chips (16) emitting in a range from 430 to 480 nm. Filter structures further include various dual band-pass filters and multiple band-pass filters in combination with long-pass filters that provide targeted emissions in specific IR wavelength bands. Filter structures may be provided as part of cover structures (36) over LED chips (16) as various multiple- layer dielectric layer sequences. IR light-absorbing particles (48) may be further provided in combination with filter structures to provide further targeted emissions.

The invention discloses Eu < 3 + >-doped gallium aluminate red light-emitting glass as well as a preparation method and application thereof, and relates to the technical field of light-emitting materials. The luminescent glass is prepared by adopting a melting-cooling method, and the preparation method comprises the following steps: weighing SiO2, B2O3, Na2O and Lu3AlGa3. 93O12. 0.07 Eu < 3 + > raw materials according to a ratio, grinding, mixing, melting at a high temperature to form a uniform glass melt, and cooling and molding to obtain the luminescent glass. The luminescent glass can stably emit light under the excitation of ultraviolet light and blue light with the wave band of 200-480 nm, has the characteristic of wide excitation range, and can be well matched with near ultraviolet or commercial blue light LED chips. Under excitation of 395 nm blue light, the luminescent glass emits red light mainly with the wavelength of 593 nm and 610 nm, and shows good color purity and color rendering performance along with 709 nm near-infrared emission components. Furthermore, the luminescent glass can still keep stable red light emission intensity under a high-temperature condition, presents a luminescent enhancement trend in a heating process, and shows good luminescent thermal stability. The luminescent glass is suitable for high-power solid-state illumination and related high-temperature photoelectric application fields.

The invention discloses composite fluorescent powder and a preparation method thereof, and belongs to the technical field of inorganic luminescent materials. The composite fluorescent powder contains A wt% of KPbBr and (100-A) wt% of KBr, and A is equal to 5-95. In the KPbBr / KBr composite system, KPbBr is a luminous component and emits orange yellow light under the irradiation of ultraviolet light. The composite fluorescent powder can be prepared only through simple dissolution and crystallization processes. An expensive cesium source is replaced by a cheap potassium source, the process is simple and environment-friendly, the cost is low, and the product has excellent stability and can be applied to the fields of solid-state illumination, photoelectric detection, anti-counterfeiting marks and the like.

The application provides an excimer acceptor material based on a nitrogen heterocycle, a preparation method and application thereof, and belongs to the technical field of organic photoelectric materials. Two excimer acceptor materials are synthesized by combining 2-phenyl-4,6 di(4-pyridine)-1,3,5-triazine with spirobifluorene and pyridine. The synthesis method is simple, the yield is high, and the excimer acceptor material has good electrochemical stability. The spirobifluorene is added to improve the molecular rigidity, reduce non-radiative transition and reduce efficiency roll-off. The pyridine is added to deepen the LUMO level, which is conducive to the development of red excimer OLED. The synthesized excimer acceptor material is combined with a donor material to form an excimer, which is used as a light-emitting layer of an organic electroluminescent device. The excimer can realize yellow light and orange red light emission, has a high external quantum efficiency, and the highest external quantum efficiency can reach 11.5%. The excimer has a wide application prospect and can be widely applied in the fields of flat panel display and solid state lighting.

The application provides a high-efficiency thermally activated delayed fluorescence host material and a preparation method and application thereof, belongs to the technical field of organic photoelectric materials, and is obtained by combining 5,7-dihydro-7,7-dimethylindeno[2,1-b]carbazole and 2-(3-bromophenyl)-4,6-diphenyl-1,3,5-triazine, has the advantages of simple synthesis method, easily obtained raw materials, stable material structure, easy storage, and the like. The synthesized thermally activated delayed fluorescence host material is applied to an OLED device, the bromine atom attached to the triazine fragment enhances single-triplet state exciton conversion, improves high-efficiency energy transmission to a guest light-emitting material, and thus improves device efficiency. Compared with a traditional host material CBP, the application has obvious advantages, and thus has a wide application prospect and is optimistic, and is expected to be widely applied in the fields of flat panel display and solid-state lighting.

The application discloses a narrow-band blue light molecule and a preparation method and application thereof. The application introduces two donor units into a fluorene skeleton, forms a dislocation structure with a multiple resonance unit in space, and regulates the strength of the space charge transfer. On one hand, the reverse intersystem crossing rate can be improved to improve the performance and efficiency of a device. On the other hand, the high-efficiency light emission of the narrow-band is maintained. The application further discloses a preparation method and application of the material. The narrow-band blue light molecule can be used as a novel light-emitting molecule with high performance, high color purity and high quantum efficiency. The narrow-band blue light molecule has great application potential in the preparation of light-emitting materials, light-emitting devices and electronic technology, and has a bright prospect in the field of display technology and solid-state lighting.

The application provides a white light phosphor powder based on copper-iodine organic hybrid clusters and a preparation method thereof, and has a structure shown in formula I. The structure of the white light phosphor powder in the application is that Cu4I4 is used as an inorganic core, and copper atoms are coordinated with nitrogen and phosphorus atoms on ligands to form a stable and unique cluster structure. The light emitting mechanism of the cluster is charge transfer from the inorganic core to the ligand, and the simple core and the ligand cooperate with each other to form degenerate emission energy levels, so that white light emission with double wide peaks from 400 to 800 nm is realized. The light emitting quantum yield reaches 97.8%. The material also exhibits excellent stability, and the thermal decomposition temperature is as high as 265 DEG C. The material also has low thermal quenching, and still maintains more than 80% of the original light emitting quantum yield under the condition of 240 DEG C. The application also provides an application of the white light phosphor powder based on copper-iodine organic hybrid clusters. The white light phosphor powder is applied to the field of solid state lighting, and has significant advantages and application prospects.

The invention discloses a tetradentate platinum (II) complex derivative containing a stereo aryl group and a preparation method and application thereof, the complex derivative has a nitrogen heterocyclic carbene ligand containing the stereo aryl group, and the core structure is modified by one or more aromatic substituent groups to form a distorted three-dimensional molecular configuration; w, E and X atoms in substituent groups are selected from silicon, germanium or carbon atoms, the substituent groups cover various alkyl groups, aryl groups, heteroaryl groups and spiro structures, and part of hydrogen atoms can be replaced by deuterium atoms; through reasonable design of a ligand structure and a substituent group, the complex derivative has high luminous efficiency, high color purity and good thermal stability, can effectively inhibit luminescence quenching caused by molecular accumulation, and can be used for preparing a thin film through various modes such as vacuum evaporation, a solution method and the like; when the blue light-emitting material is applied to a light-emitting layer of an organic light-emitting device, high-efficiency, narrow-band and long-life blue light electroluminescence can be realized, and the blue light-emitting material has important application value in the fields of solid-state illumination, flexible display and the like.