| 摘要 |
A light source apparatus including light spectrum-converting materials that emit light primarily over large portions of the 360 nm-480 nm and the 590-860 nm spectral range is provided. This apparatus provides a cooled, high-luminance, high-efficiency light source that can provide a broader spectrum of light within these spectral ranges than has been cost-practical by using many different dominant peak emission LEDs. Up to 15% of the output radiant power may be in the spectral range 350-480 nm in one embodiment of this device, unless a specific separate source and lamp operating mode is provided for the violet and UV. Control methods for light exposure dose based on monitoring and controlling reflected or backscattered light from the illuminated surface and new heat management methods are also provided. This flexible or rigid light source may be designed into a wide range of sizes or shapes that can be adjusted to fit over or around portions of the bodies of humans or animals being treated, or mounted in such a way as to provide the special spectrum light to other materials or biological processes. This new light source can be designed to provide a cost-effective therapeutic light source for photodynamic therapy, intense pulsed light, for low light level therapy, diagnostics, medical and other biological applications as well as certain non-organic applications. |
| 主权项 |
1. A light emitting device for generating a predominantly non-coherent output light, comprising one or more spectrum converters, one or more LEDs, and one or more power supplies arranged for energizing the one or more LEDs, wherein the device is configured to produce the output light with an output photon flux that is predominantly in the orange-to-near-infrared (ONIR) 595 nm-960 nm spectral range, and with light energy at all wavelengths within such ONIR spectral range, wherein the light emitting device exhibits all the following characteristics:
(a) one or more of the LEDs are overlaid with one or more spectrum-converting fluorescent and/or phosphorescent containing materials or photonic spectrum-shifting structures, as said spectrum converters; (b) converted LED light sources with spectrum converters in the light emitting device are configured to contribute over 25% of the total output radiant light power of the output light; (c) internal quantum yield of spectrum converters averages over 60% when independent of the light emitting device and under optimal conditions; (d) one(s) of the one or more LEDs to be spectrum converted provide dominant spectral emission peaks between 350 nm and 480 nm and/or between 590 and 780 nm; (e) 350 nm and 480 nm dominant peak LEDs with spectrum converters use a phosphor or QD as the spectrum converter for absorption of over 70% of the normal angle LED radiant power light; (f) 600 nm-780 nm dominant emission peak LEDs with spectrum converters use a fluorescent dye or QD spectrum converter for absorption of over 30% of the normal angle LED radiant power light; (g) over 70% of the total output light from the device is in the 595-960 nm spectral range; (h) at least 1% of the highest radiant power peak in the 600 nm-750 nm part of the emitted light spectrum of the output light is provided at all wavelengths between 600 nm and 820 nm; (i) LED(s) of the one or more LEDs, whose light is not significantly absorbed by the spectrum converters comprise LEDs with dominant peak wavelengths within the 350 nm-480 nm spectral range and/or within the 650 nm to 960 nm spectral range; (j) the device comprises a lighted window at which the light output is emitted, and the device provides at least 5 mW/cm2 average radiant power output in a primary lighted portion of the lighted window and the primary lighted portion of the lighted window comprises a lighted area of at least 4 cm2; (k) at least 60% of the area of the primary lighted portion of the lighted window contains over 30% reflective surfaces at the highest spectral emission peak of the output light, not including area used by LEDs or spectrum converters, to reflect light back into the output light; (l) LED light is provided by at least one of the one or more LEDs behind the lighted window, in the perimeter of the lighted window, or brought to the lighted window using fiber optics; (m) a thermal controller is arranged to interrupt or reduce power from the one or more power supplies when the temperature at the LED heat sink or at the LEDs inside the device exceeds a predetermined value; and (n) wherein when the LED light is not brought to the window by fiber optics, the thermal controller is effective to prevent the light-output side surface temperature of the device from exceeding 70° C. after 60 minutes of device operation in a 35° C. ambient environment. |
