Presented is an LED device that produces white light by performing phosphor
conversion on substantially all of the primary light emitted by the light
emitting structure of the LED device. The LED device comprises a light
emitting structure and at least one phosphor-converting element located to
receive and absorb substantially all of the primary light. The
phosphor-converting element emits secondary light at second and third
wavelengths that combine to produce white light. Some embodiments include
an additional phosphor-converting element, which receives light from a
phosphor-converting element and emits light at a fourth wavelength. In the
embodiments including an additional phosphor-converting element, the
second, third, and fourth wavelengths combine to produce white light. Each
phosphor-converting element includes at least one host material doped with
at least one dopant. The phosphor-converting element may be a phosphor
thin film, a substrate for the light emitting structure, or a phosphor
powder layer.