Method of microbially producing metal gallate spinel nano-objects, and compositions produced thereby

A method of forming a structure for emitting white light, the method comprising:

• forming a first phosphor of a first doped zinc gallate spinel structure that is nucleated by a first fermentation with a first thermophilic bacteria and first annealing, wherein the first phosphor emits a first wavelength of red light ranging from 570 nm to 750 nm;
• forming a second phosphor of a second doped zinc gallate spinel structure that is nucleated by a second fermentation with a second thermophilic bacteria and a second annealing, wherein the second phosphor emits a wavelength of green light ranging from 495 nm to 570 nm;
• forming a third phosphor of a third zinc gallate spinel structure that is nucleated by a third fermentation with a third thermophilic bacteria, wherein the third phosphor emits a wavelength of blue light ranging from 400 nm to 495 nm;
• and
• mixing at least the first phosphor, second phosphor and third phosphor to form the structure for emitting the white light.

A white light emitting structure comprising:

• a first zinc gallate spinel doped with chromium or europium that provides a red light emitting phosphor;
• a second zinc gallate spinel doped with manganese that provides a green light emitting phosphor;
• a third zinc gallate spinel that provides a blue light emitting phosphor;
• and
• a transparent substrate, wherein the first zinc gallate spinel, the second zinc gallate spinel, and
• the third zinc gallate spinel are distributed as a mixture of said first, second, and third zinc gallate spinels on or within the transparent substrate.