Stanley Electric has patented a semiconductor light emitting device that emits mixed color light using a semiconductor light emitting element and a fluorescent body layer containing specific fluorescent bodies. The device ensures the intensity of the semiconductor light emitting element is significantly lower than the combined light intensity from the fluorescent bodies. GlobalData’s report on Stanley Electric gives a 360-degree view of the company including its patenting strategy. Buy the report here.

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According to GlobalData’s company profile on Stanley Electric, Under-screen biometric identification was a key innovation area identified from patents. Stanley Electric's grant share as of February 2024 was 59%. Grant share is based on the ratio of number of grants to total number of patents.

Patent granted for a light emitting device with specific color output

Source: United States Patent and Trademark Office (USPTO). Credit: Stanley Electric Co Ltd

A recently granted patent (Publication Number: US11916175B2) discloses a semiconductor light emitting device that includes a semiconductor light emitting element emitting excitation light in the range of 440 to 450 nm. The device also features a fluorescent body layer containing two fluorescent bodies emitting light in the ranges of 540 to 575 nm and 590 to 605 nm, respectively. The intensity of the radiation light from the semiconductor light emitting element is significantly lower compared to the combined light from the fluorescent bodies, ensuring a specific color balance in the emitted light.

Furthermore, the patent describes additional features such as the integral value of a blue-green light component in the emitted light, the ratio of the two fluorescent bodies in the fluorescent body layer, the excitation purity in chromaticity coordinates, and the main wavelength of the emitted light. The patent also details the specific composition formulas of the fluorescent bodies used in the device. Additionally, a semiconductor light emitting module comprising multiple semiconductor light emitting devices with varying ratios or concentrations of the fluorescent bodies is also part of the patent, allowing for emission of light in different chromaticity regions. These innovations aim to enhance the quality and versatility of semiconductor light emitting devices in various applications.

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GlobalData, the leading provider of industry intelligence, provided the underlying data, research, and analysis used to produce this article.

GlobalData Patent Analytics tracks bibliographic data, legal events data, point in time patent ownerships, and backward and forward citations from global patenting offices. Textual analysis and official patent classifications are used to group patents into key thematic areas and link them to specific companies across the world’s largest industries.