Light emitting device

By using light-emitting elements and phosphors within a specific wavelength range in the light-emitting device, and adjusting the luminous flux ratio and intensity ratio, the problems of visual discernibility differences and glare in visual environments are solved, achieving a bright effect under both dark and light vision, and improving the wavelength conversion efficiency of the phosphor.

CN120916550APending Publication Date: 2025-11-07NICHIA CORP
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Patent Information

Application Number
CN202510987452.1
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Priority Date
2019-12-24
Filing Date
2020-10-23
Publication Date
2025-11-07

AI Technical Summary

Technical Problem

Existing light-emitting devices exhibit differences in visibility under both light and dark vision conditions, and the wavelength conversion efficiency of phosphors is insufficient, causing the human eye to perceive darkness under light vision conditions and glare under dark vision conditions.

Method used

By employing a light-emitting element with a dominant wavelength in the range of 430nm to 500nm and a phosphor with a peak emission wavelength in the range of 507nm to 660nm, the ratio of light flux under dark vision to light vision (S/P ratio) is ensured to be less than 6.5, and the luminous intensity at the peak emission wavelength of the light-emitting element is higher than that at the peak emission wavelength of the phosphor.

Benefits of technology

It achieves bright visibility under both scotopic and photopic conditions, while reducing glare for the human eye and improving the wavelength conversion efficiency of the phosphor.

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Abstract

The invention provides a light-emitting device which is bright in both scotopic vision and photopic vision and reduces dazzling to people. The light-emitting device includes a light-emitting element having a dominant wavelength in the range of 430 nm to 500 nm, and a phosphor excited by light from the light-emitting element and having an emission peak wavelength in the range of 507 nm to 660 nm, and emits light having a dominant wavelength in the range of 490 nm to 500 nm. The S / P ratio, which is the ratio of the luminous flux in scotopic vision to the luminous flux in photopic vision, is 6.5 or less, and the luminous intensity at the luminous peak wavelength of the light-emitting element is higher than the luminous intensity at the luminous peak wavelength of the phosphor.
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Citation Information

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