PHASE TRANSITION COOLING IN LED LIGHTING DEVICES

A lighting device is provided comprising a chip-on-board (COB) light emitting diode (LED) light source, a phase transfer fluid disposed in a hermetically sealed phase transfer fluid chamber, a phase transfer fluid wicking structure, a distributed color conversion medium, and a glass containment plate. The color conversion medium is distributed in two dimensions over an emission field of the lighting device within the glass containment plate. The COB LED light source comprises a thermal heat sink framework and at least one LED and defines the hermetically sealed phase transfer fluid chamber in which the phase transfer fluid is disposed. The glass containment plate is positioned over the hermetically sealed phase transfer fluid chamber and contains the distributed color conversion medium. The phase transfer fluid wicking structure is transparent to at least a portion of the operating wavelength bandwidth of the LED and is configured within the hermetically sealed phase transfer fluid chamber to encourage transport of phase transfer fluid, permit vaporization of transported phase transfer fluid, and receive condensed phase transfer fluid vapor.