WAVELENGTH CONVERTER AND LIGHT-EMITTING DEVICE

摘要

PROBLEM TO BE SOLVED: To provide an inexpensive and miniaturizable wavelength converter exhibiting good wavelength conversion efficiency in a light-emitting device in which a semiconductor phosphor having ≤10 nm average particle diameter is combined with an LED (light-emitting diode) chip and to provide the light-emitting device using the wavelength convertor.

SOLUTION: The wavelength converter 1 is formed of a polymer 5 containing droplets 3 having 0.05-100 μm size. The droplets 3 are composed of a liquid 9 with ≤0.1 mass% of moisture content and a semiconductor phosphor 7 present in a dispersed state in the liquid 9 and having 0.5-10 nm average particle diameter. The oxygen permeability of the polymer 5 is ≤10×106cm3[STP (standard temperature and pressure)] cm/(cm2s cmHg). The light-emitting device is provided with a light-emitting element and the wavelength converter 1 converting the wavelength of light from the light-emitting element.

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