摘要:
Light emitting devices include a light emitting diode (“LED”) and a recipient luminophoric medium that is configured to down-convert at least some of the light emitted by the LED. In some embodiments, the recipient luminophoric medium includes a first broad-spectrum luminescent material and a narrow-spectrum luminescent material. The broad-spectrum luminescent material may down-convert radiation emitted by the LED to radiation having a peak wavelength in the red color range. The narrow-spectrum luminescent material may also down-convert radiation emitted by the LED into the cyan, green or red color range.
摘要:
Light emitting devices include a light emitting diode (“LED”) and a recipient luminophoric medium that is configured to down-convert at least some of the light emitted by the LED. In some embodiments, the recipient luminophoric medium includes a first broad-spectrum luminescent material and a narrow-spectrum luminescent material. The broad-spectrum luminescent material may down-convert radiation emitted by the LED to radiation having a peak wavelength in the red color range. The narrow-spectrum luminescent material may also down-convert radiation emitted by the LED into the cyan, green or red color range.
摘要:
A lighting device comprising a solid-state light source, and a diffuser configured for color mixing of the light from the solid-state light source and spatially separated therefrom, the diffuser comprising at least one phosphor material. Methods of fabricating a lighting device having a reduced total amount of phosphor comprising combining an amount of phosphor with a diffuser structure.
摘要:
A lighting device capable of generating warm or neutral white light using blue light-emitting diodes (“LEDs”), red LEDs, and/or luminescent material that responds to blue LED emission is disclosed. The lighting device includes multiple first solid-state light-emitting structures (“SLSs”), second SLSs, and balancing resistor element. The first SLS such as a string of blue LED dies connected in series is able to convert electrical energy to blue optical light, which is partially turned into longer wavelength emission by the luminescent material. The second SLS such as a red LED die is configured to convert electrical energy to red optical light, wherein the second SLSs are connected in series. While the first SLSs and second SLSs are coupled in parallel, the balancing resistor element provides load balance for current redistribution between the first and second SLSs in response to fluctuation of operating temperature.
摘要:
An LED lamp or bulb is disclosed that comprises a light source, a heat sink structure and an optical cavity. The optical cavity comprises a phosphor carrier having a conversions material and arranged over an opening to the cavity. The phosphor carrier comprises a thermally conductive transparent material and is thermally coupled to the heat sink structure. An LED based light source is mounted in the optical cavity remote to the phosphor carrier with light from the light source passing through the phosphor carrier. A diffuser dome is included that is mounted over the optical cavity, with light from the optical cavity passing through the diffuser dome. The properties of the diffuser, such as geometry, scattering properties of the scattering layer, surface roughness or smoothness, and spatial distribution of the scattering layer properties may be used to control various lamp properties such as color uniformity and light intensity distribution as a function of viewing angle.
摘要:
A packaged light emitting diode (LED) includes a submount, a monolithic multi-junction LED on the submount, and an encapsulant material on the monolithic multi-junction LED. The monolithic multi-junction LED includes a substrate, a plurality of sub-LEDs on the submount, a plurality of conductive metal interconnects coupled to the sub-LEDs and connecting the sub-LEDs in a predetermined arrangement including an anode contact and a cathode contact, and an electrostatic discharge protection circuit in the substrate and coupled in parallel with the arrangement of sub-LEDs.
摘要:
Carbon nanotube (CNT) arrays can be used as a thermal interface materials (TIMs). Using a phase sensitive transient thermo-reflectance (PSTTR) technique, the thermal conductance of the two interfaces on either side of the CNT arrays can be measured. The physically bonded interface has a conductance ˜105 W/m2-K and is the dominant resistance. Also by bonding CNTs to target surfaces using indium, it can be demonstrated that the conductance can be increased to ˜106 W/m2-K making it attractive as a thermal interface material (TIM).
摘要翻译:碳纳米管(CNT)阵列可用作热界面材料(TIM)。 使用相敏瞬态热反射(PSTTR)技术,可以测量CNT阵列任一侧上两个界面的导热性。 物理键合界面电导率为〜105 W / m2-K,为主导电阻。 也可以通过使用铟将CNT粘合到靶表面,可以证明电导率可以提高到〜106W / m 2 -K,使其作为热界面材料(TIM)具有吸引力。
摘要:
A two-sided carbon nanostructure thermal interface material having a flexible polymer matrix; an array of vertically aligned carbon nanostructures on a first surface of the flexible polymer matrix; and an array of vertically aligned carbon nanostructures on a second surface of the flexible polymer matrix, wherein the first and second surfaces are opposite sides of the flexible polymer matrix.
摘要:
A carbon nanostructure adhesive for adhering two surfaces together, including: an array of vertically aligned carbon nanostructures on a first surface; and a second surface positioned adjacent to the vertically aligned carbon nanostructures such that the vertically aligned carbon nanostructures adhere the first and second surfaces together by van der Waals forces.