Substrate design for optimized performance of up-conversion phosphors utilizing proper thermal management

A method for using an up-conversion phosphor as an emitting material in a transmissive display comprising the step of:

• designing a shape and material of said display to maximally remove any heat developed in the emitting material when pumped with an intensity and a duration, wherein the luminescent efficiency of said up-conversion phosphor is substantially increased.

A blue green red (BRG) display medium comprising:

• (a) pixels having a blue, a green and a red emitter dispersed on a high heat conductive substrate;
• and,
• (b) means for pulsing said pixels with a beam of light with wavelength near approximately 980 μm, wherein said high heat conductive substrate provides thermal management to optimize performance of said pixels to emit appropriate blue, green and red luminescence when pumped with the 980 μm wavelength beam of light.