SEMICONDUCTOR LIGHT EMITTING DEVICE AND VEHICLE LIGHT HAVING THE SAME

• Main Authors: NIHEI NORIKO, YAMAJI TOMOAKI
• Format: Patent
• Language: English; Japanese
• Published: 27.09.2023
• Subjects: BASIC ELECTRIC ELEMENTS; BLASTING; ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR; ELECTRICITY; FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMSTHEREOF; HEATING; LIGHTING; MECHANICAL ENGINEERING; NON-PORTABLE LIGHTING DEVICES; SEMICONDUCTOR DEVICES; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHERARTICLES, NOT OTHERWISE PROVIDED FOR; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLEEXTERIORS; WEAPONS

To provide a light emitting device with improved chromaticity uniformity by suppressing changes in chromaticity due to changes in the emission angle of a light emitting element that combines an LED element and a wavelength conversion member.SOLUTION: An optical multilayer film placed on the light emitting element has a transmission spectrum that monotonically increases from 0 degrees to at least 60 degrees in the peak wavelength of an LED element and from 0 degrees to at least 60 degrees in the long wavelength region (650 nm to 700 nm), with a transmittance of at least 90% at 550 nm, when the angle in the direction perpendicular to the light emitting surface is 0 degrees and the angle parallel to the light emitting surface is 90 degrees.SELECTED DRAWING: Figure 3 【課題】LED素子と波長変換部材とを組み合わせた発光素子の出射角度の変化による色度の変化を抑制し、色度の均一性が向上した発光装置を提供する。【解決手段】発光素子の上に配置される光学多層膜は、光出射面と垂直な方向の角度を０度とし光出射面と平行な方向の角度を９０度としたとき、LED素子のピーク波長において、０度から少なくとも角度６０度の範囲で単調に増加し、長波長領域（650ｎｍ～700ｎｍ）において、０度から少なくとも６０度の範囲で単調に増加し、且つ550ｎｍにおける透過率が９０％以上である透過スペクトルを有している。【選択図】図３