Light emitting device and manufacturing method thereof

Abstract

The invention provides a light emitting device and a manufacturing method thereof. The light emitting device comprises a light emitting element, a wavelength conversion layer and a light adjusting layer. The light emitting element comprises a first upper surface, a lower surface and a side surface between the first upper surface and the lower surface. The wavelength conversion layer comprises a transparent adhesive, multiple wavelength conversion particles and a second upper surface which covers the first upper surface. The light adjusting layer surrounds the side surface of the light emittingelement and has a first composition or a second composition. The first composition comprises a first adhesive and multiple first diffusion particles which are dispersed in the first adhesive. The weight percentage between the multiple first diffusion particles and the light adjusting layer is not smaller than 20%. The second composition comprises a second adhesive, multiple second diffusion particles which are dispersed in the second adhesive, and multiple light diffusion particles which are dispersed in the second adhesive. The weight percentage between the multiple second diffusion particles and the light adjusting layer is not lower than 5%. Furthermore the weight percentage between the multiple light diffusion particles and the light adjusting layer is not lower than 0.4%.

Description

technical field [0001] The present invention relates to a light emitting device and a manufacturing method thereof, in particular to a light emitting device including a wavelength conversion layer and a light adjustment layer and a manufacturing method thereof. Background technique [0002] The light-emitting diode element (Light-Emitting Diode; LED) in the solid-state light-emitting element has the characteristics of low power consumption, low heat generation, long operating life, impact resistance, small size, and fast response, so it is widely used in various needs. The field of light-emitting elements, for example, vehicles, home appliances, and lighting fixtures. [0003] There are several ways to convert the pure color light emitted by LEDs into light of other colors. For example, the LED can be covered with a wavelength conversion layer, such as a phosphor layer, to achieve this purpose. Phosphor powder is a photoluminescent substance, which can also be said to be a...

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Problems solved by technology

[0006] In addition, under the trend of shrinking LED size after packaging, the light mixing distance between LED and wavelength conversion material becomes smaller, so it is easy to cause the problem of uneven distribution of color or color temperature of mixed light

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