Phase transition cooling in led lighting devices

A lighting device 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, wherein:

• 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, contains the distributed color conversion medium, and defines high operating temperature regions TH of the lighting device;
• the thermal heat sink framework of the light source defines low operating temperature regions TC of the lighting device;
• and
• 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
• (i) encourage the transport of phase transfer fluid along a fluid transport path extending from low operating temperature regions TC of the lighting device to high operating temperature regions TH of the lighting device within the fluid chamber,
• (ii) permit vaporization of the transported phase transfer fluid in the high operating temperature regions TH of the lighting device, and
• (iii) receive condensed phase transfer fluid vapor in the low operating temperature regions TC of the lighting device for return transport to the high operating temperature regions TH of the lighting device via the phase transfer fluid wicking structure.