A light generating system comprising a luminescent converter comprising a first luminescent material and a second luminescent material

The light generating system addresses luminescent material degradation in pc-LEDs by using a dual luminescent material setup to stabilize and enhance luminous efficacy, achieving improved stability and reduced harmful blue light emission.

WO2026131493A1PCT designated stage Publication Date: 2026-06-25SIGNIFY HOLDING BV
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Patent Information

Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
SIGNIFY HOLDING BV
Filing Date
2025-12-12
Publication Date
2026-06-25

AI Technical Summary

Technical Problem

Luminescent materials in red pc-LEDs are susceptible to degradation due to moisture and oxygen, leading to changes in color point, efficiency drop, and increased harmful blue light emission, with poor luminous efficacy due to non-overlapping emission peaks with human eye sensitivity.

Method used

A light generating system comprising a first solid state light source and a luminescent converter with a first luminescent material and a second luminescent material, where the first luminescent material converts light into a narrowband emission closer to human eye sensitivity, and the second luminescent material enhances spectral power distribution, stabilizing the system and improving luminous efficacy.

Benefits of technology

The system provides a more stable and efficient pc-LED with improved luminous efficacy by shifting the centroid wavelength towards human eye sensitivity, offering enhanced stability and reduced harmful blue light emission.

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Abstract

The invention provides a light generating system (1000) comprising a first light generating device (110), wherein the first light generating device (110) comprises a first solid state light source (10) and a luminescent converter (2000), wherein: (A) the first solid state light source (10) is configured to generate first light source light (11) having a first peak emission wavelength (λp1) selected from the range of 380-490 nm; (B) the luminescent converter (2000) is configured in a light receiving relationship with the first solid state light source (10); wherein the luminescent converter (2000) comprises a first luminescent material (210) and a second luminescent material (220); (C) the first luminescent material (210) comprises a luminescent material of the type M'xM2 - 2xAX6:Mn4+, wherein M' comprises an alkaline earth cation, M comprises a monovalent cation, at least comprising Na, x is in the range of < 1, wherein A comprises a tetravalent cation, comprising one or more of silicon, titanium, and germanium, and wherein X comprises a monovalent anion, at least comprising fluorine; wherein the first luminescent material (210) is configured to convert at least part of the first light source light (11) received by the first luminescent material (210) into first luminescent material light (211); wherein the first luminescent material light (211) has a first centroid wavelength (λc1) selected from the range of 610-650 nm; wherein the first luminescent material light (211) comprises at least one emission band having a first full width at half maximum FWHM1 of ≤ 50 nm; (D) the second luminescent material (220), different from the first luminescent material (210), is configured to convert at least part of the first light source light (11) received by the second luminescent material (220) into second luminescent material light (221); wherein the second luminescent material light (221) has a second centroid wavelength (λc2) selected from the range of 600-660 nm; and (E) the first light generating device (110) is configured to generate first device light (111), wherein the first device light (111) comprises the first luminescent material light (211) and the second luminescent material light (221); wherein the first device light (111) has a spectral power distribution, wherein (i) x1% of the spectral power in the wavelength range of 380-780 nm is provided by the first luminescent material light (211), and (ii) x2% of the spectral power in the wavelength range of 380-780 nm is provided by the second luminescent material light (221); wherein 0.25 ≤ x1 / x2 ≤ 1.4; and wherein x1 + x2 ≥ 90%.
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