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Efficient light extraction, color conversion and directional emission in µLEDs

Efficient light extraction, color conversion and directional emission in µLEDs. Srinivasan Anand Division of Semiconductor Materials Department of Applied Physics, School of Engineering Sciences. Yohan Désières. Srinivasan Anand. Nanodisk Mie Resonators META SURFACES.

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Efficient light extraction, color conversion and directional emission in µLEDs

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  1. Efficient light extraction, color conversion and directional emission in µLEDs SrinivasanAnand Division of Semiconductor Materials Department of Applied Physics, School of Engineering Sciences Yohan Désières

  2. Srinivasan Anand Nanodisk Mie Resonators META SURFACES Light trapping, antireflection, light extraction Light Manipulation Functions Photonic Semiconductor nanostructures Optical nonlinearity Surface non-linearity III-Nitride LEDs: light extraction and color conversion Optical biosensors Color filters Photonic Crystals

  3. LEDs: Energy efficiency and more than lumen Energy Efficiency : More Lumens Smart Use of Light/ Lighting : More than Lumens applications Smart Lighting systems; Internet of things Smart control over light generation Spectral control for tailored applications Human centric (health care, office etc) Light engines for farming (indoor farms; Algae factories) µ-LEDs: small foot-print (5-20µmx5-20µm) Control of light in small areas Arrays (linear) 2D Arrays with full RGB : microdisplays Battery powered applications – high efficiency Applications in maskless lithography (print heads) Optical stimulation of nerves (Optogenetics) William Henry, Infiniled; “MicroLEDArrays Find Applications in the Very Small” Photonics Spectra, Mar 2013

  4. The Project’s Key Concepts and Goals Add on strúctured film • Light extraction function • Avoids direct structuring of LED • Possible light scattering control LED • efficient light extraction • color conversion (Blue to Red) • directional light emission

  5. SOFT LITHOGRAPHY/ DIRECT EMBOSSING Stamp Nanoparticle layer Substrate Examples: Printed Titania nanoparticles (mixure of anastase and rutile phase)

  6. Optical Power Enhancement Optical power for 6 LEDs and 5 reference LEDs μ-luminescence image (laser=405 nm & NA=0.95)

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