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

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

ACS Nano

Department of Physics of Information in Matter and Center for Nanophotonics, NWO-I Institute AMOLF, Science Park 104, NL 1098XG Amsterdam, The Netherlands.

Published: December 2024

AI Article Synopsis

  • Phosphor-converted micro-LEDs are important for displays but struggle with light extraction due to their blue pump chip's high refractive index.
  • This study introduces a nanophotonic method that enhances light extraction efficiency by up to three times by engineering the local density of optical states (LDOS) using a low-index spacer and a metasurface.
  • The experimental results show that integrating plasmonic antennas and a silica spacer leads to significantly brighter and more directional emissions, making this technology valuable for applications in AR/VR devices and smartwatches without bulky optics.

Article 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 system solver for dipole emission. Experimentally, the integration of plasmonic antennas and a silica spacer resulted in a 3-fold overall brightness enhancement, with nearly a 4-fold increase in forward emission. This nanophotonic metasurface waveguide design is a critical advancement for producing bright, directional micro-LEDs, particularly in augmented/virtual reality (AR/VR) devices and smartwatch displays, without the need for bulky secondary optics or reflectors.

Download full-text PDF

Source
http://dx.doi.org/10.1021/acsnano.4c13472DOI Listing

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