Optical cavity including a light emitting device and wavelength converting material

A light-emitting device, comprising:

• one or more light emitting diodes (LEDs) disposed on a surface of a substrate;
• a first wavelength-converting layer disposed on the surface of the substrate, the first wavelength-converting layer covering the entire surface of the substrate except for portions of the surface of the substrate that are situated underneath any of the one or more LEDs, the first wavelength-converting layer having a thickness that is equal to or less than a thickness of any of the one or more LEDs, and the first wavelength-converting layer being formed of a plurality of wavelength-converting materials disposed in different regions of the first wavelength-converting layer;
• a second wavelength-converting layer disposed above the one or more LEDs and the first wavelength-converting layer;
• and
• an optical cavity between the first and second wavelength-converting layers.