Tunnel junction cascade type led with different pump wavelengths
By cascading and depositing pn junctions with different emission wavelengths on LED chips and combining them with phosphor materials, the problems of color fidelity and emission non-uniformity of existing phosphor-converted LEDs at high power have been solved, achieving efficient and uniform spectral conversion effect.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- LUMILEDS LLC
- Filing Date
- 2024-10-25
- Publication Date
- 2026-05-29
AI Technical Summary
Existing phosphor-converted LED devices struggle to achieve high color fidelity and continuous or enhanced emission within the blue-cyan range when operating at high power. Furthermore, existing solutions such as violet-pumped and dual-pumped LEDs suffer from low efficiency or poor color uniformity.
A cascaded LED structure is adopted, in which first and second pn junctions, separated by a tunnel junction, are sequentially deposited on the same wafer, each having a different emission wavelength in the range of 400-500nm, and a wavelength conversion layer is formed thereon, combined with phosphor material to achieve spectral conversion.
It achieves a spectrum with high color fidelity and high black pixel content, meeting the application requirements of high-power LEDs in compact single-die packages, and improving spectral efficiency and color uniformity.
Smart Images
Figure CN122123147A_ABST