Composite wavelength conversion powder, resin composition containing composite wavelength conversion powder, and light emitting device

Abstract

Provided are: a composite wavelength conversion powder which has high utilization efficiency of light and high utilization efficiency of a constituent material, and which is capable of achieving a good balance between highly efficient light emission and high reliability; and a resin composition which contains this composite wavelength conversion powder. This composite wavelength conversion powder is obtained by dispersing phosphor particles having a refractive index of 1.6 or more in a matrix particle which contains fine magnesium fluoride particles or fine calcium fluoride particles. Also provided is a light emitting device which is capable of improving the utilization efficiency of light produced by phosphor particles that are excited by primary irradiation light irradiated from a light emitting element, and which is capable of improving the optical output of light emission by increasing the amount of secondary irradiation light produced by the phosphor particles, while suppressing the occurrence of color unevenness or color variation of the light discharged to the outside of the device. A light emitting device (1) of the present invention is provided with a substrate (2), a light emitting element (3) that is mounted on the surface of the substrate (2), and a light transmitting member (4) that covers the light emitting element (3). This light transmitting member (4) contains composite wavelength conversion particles (12) which are composed of phosphor particles that have an average particle diameter of 500 nm or less and inorganic particles that are transparent to visible light and have an average particle diameter of 500 nm or less.

Description

technical field [0001] The present invention relates to a composite wavelength conversion powder and a resin composition containing the composite wavelength conversion powder. More specifically, it relates to an In various optical devices such as the composite wavelength conversion powder and the resin composition containing the composite wavelength conversion powder that can combine high-efficiency light emission and high reliability. [0002] In addition, the present invention relates to a light emitting device, and more specifically, to a light emitting device capable of achieving both high-efficiency light emission and high reliability, and high output and uniform light emission with little color unevenness, such as white light. [0003] This application claims priority based on Japanese Patent Application No. 2012-208651 filed in Japan on September 21, 2012, and Japanese Patent Application No. 2013-015563 filed in Japan on January 30, 2013, which are cited here content. ...

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Problems solved by technology

[0020] In addition, for the nano-phosphors whose dispersion particle size in the binder described in Patent Documents 2 and 3 is smaller than the wavelength of the excitation light and the emission light, although the loss of light utilization efficiency caused by scattering is reduced, there is a problem caused by the surface The shortcomings of the nano-phosphor itself due to defects are that the luminous efficiency is greatly reduced. In addition, there are reliability problems such as being easily affected by humidity, and the performance as a wavelength conversion material is not sufficient.

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