Metasurface-Based Phosphor-Converted Micro-LED Architecture for Displays─Creating Guided Modes for Enhanced Directionality.

ABSTRACT: Phosphor-converted micro-light emitting diodes (micro-LEDs) are a crucial technology for display applications but face significant challenges in light extraction because of the high refractive index of the blue pump die chip. In this study, we design and experimentally demonstrate a nanophotonic approach that overcomes this issue, achieving up to a 3-fold increase in light extraction efficiency. Our approach involves engineering the local density of optical states (LDOS) to generate quasi-guided modes within the phosphor layer by strategically inserting a thin low-index spacer in combination with a metasurface for mode extraction. We demonstrate the trade-offs between blue light pumping, LDOS enhancement at the converted emission wavelength, and radiation pattern control using a stratified

SUBMITTER: Pal D 

PROVIDER: S-EPMC11752504 | biostudies-literature | 2025 Jan

REPOSITORIES: biostudies-literature