摘要:
A luminescent cerium (Ce) doped compound emitting bright red light, comprising a calcium silicate nitride ternary system, such as CaSiN2δOδ:Ce3+, that crystallizes in a face-centered cubic unit cell with a lattice parameter of ˜a=14.88 Å. The Ce doped compound can be used for white light applications either: (i) to enhance the light quality of the system based on a blue LED with a yellow or green phosphor, (ii) as an orange phosphor in combination with a blue LED and a green phosphor, or (iii) as a red phosphor in a setup comprising a ultraviolet (UV) LED and red, green and blue (RGB) phosphors. Substitution of smaller elements on the Ca site or larger elements on the Si site leads to a decrease of the emission wavelength towards the yellow or orange region.
摘要:
An LED bulb includes a base, a shell, a plurality of LEDs, and a thermally conductive liquid. The shell is connected to the base. The plurality of LEDs is attached to the base and disposed within the shell. The thermally conductive liquid is held within the shell. The LED bulb is configured to produce a uniform light-distribution profile.
摘要:
A light-emitting diode (LED) bulb includes a base, a shell connected to the base, a thermally conductive liquid held within the shell, and one or more support structures disposed within the shell. One or more LEDs are mounted to the one or more support structures and immersed in the thermally conductive liquid. The one or more LEDs each comprise a semiconductor die having at least one light-emitting interface and the one or more LEDs configured to emit light from the at least one light-emitting interface directly into the thermally conductive liquid.
摘要:
An LED package comprises at least one LED that emits LED light in an LED emission profile. The LED package includes regions of scattering particles with the different regions scattering light primarily at a target wavelength or primarily within a target wavelength range. The location of the regions and scattering properties are based at least partially on the LED emission profile. The regions scatter their target wavelength of LED light to improve the uniformity of the LED emission profile so that the LED package emits a more uniform profile compared to the LED emission profile. By targeting particular wavelengths for scattering, the emission efficiency losses are reduced.
摘要:
Three new cerium (Ce) based phosphor materials based on nitride and oxy-nitride compounds emit yellow or blue to green photons upon excitation by ultraviolet (UV) or blue light radiation. The two yellow emitting compounds belong to the quartenary Ca—Al—Si—N system with distinct structures. These bright yellow phosphors can be used for white light applications by combining either a blue light emitting diode (LED) and a yellow phosphor, a blue LED and green-orange phosphors, or an ultraviolet (UV) LED with three phosphors, i.e., red, blue and green (RGB) phosphors. The bright blue-green phosphor, which may be described by Sr2SiO4-δNδ, can be used in the UV LED plus 3 RGB phosphors setup.
摘要翻译:基于氮化物和氮氧化物化合物的三种新的铈(Ce)基荧光体材料在通过紫外线(UV)或蓝光辐射激发时,发出黄色或蓝色至绿色光子。 两种黄色发光化合物属于具有不同结构的四元Ca-Al-Si-N体系。 这些亮黄色荧光体可以通过将蓝色发光二极管(LED)和黄色荧光体,蓝色LED和绿色橙色荧光体或具有三种荧光体的紫外线(UV)LED组合在一起而用于白光应用,即红色 ,蓝色和绿色(RGB)荧光粉。 可以用Sr 2 SiO 4 -TH N 3 N 3 N 3描述的亮蓝绿色荧光体可用于UV LED加上 3个RGB荧光粉设置。