A White Light Emitting Device
Patent No. EP4182403 (titled "A White Light Emitting Device") was filed by Signify Holding on Jul 20, 2022. The application was issued on Sep 18, 2024.
Patent Summary
A white light emitting device comprises a substrate with at least one string of blue LED chips having a dominant wavelength of 445–460 nm. The device utilizes a phosphor material composition consisting of a yellow-green phosphor (peak emission 520–580 nm) and a narrow-band red phosphor (peak emission 625–635 nm). The narrow-band red phosphor content is 33–49 wt.% for a correlated color temperature (CCT) of 4000–6500 K, or 60–70 wt.% for a CCT of 2700–3500 K. The device is configured to generate white light with an efficiency of at least 230 lm/W at a blue LED chip input current density of 10–60 mA/mm². Optional embodiments include a broad-spectrum red phosphor for lower CCTs, an encapsulant, or a chip-to-chip distance $\ge$ 0.4 mm.
Patent Family
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Dossier Documents
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Date
Description
EP4182403
- Application Number
- EP22751732A
- Filing Date
- Jul 20, 2022
- Status
- Granted And Under Opposition
- Aug 15, 2024
- Publication Date
- Sep 18, 2024
- External Links
- Slate, Register , Google Patents