Smart Luminaire

Motivation

© Fraunhofer IOF

Trend:

Intelligent lighting fixtures by tailor-made light distributions for lighting applications of the 21st century   

Challenge:

High material transparency, precision, and shape of printed optics

Aim:

Differentiation and increased efficiency of the production by means of printing and laser patterning technologies for the manufacture of a car headlight demonstrated on printed refractive and diffractive optical elements

Results Smart Luminaire

Inkjet Printed, Optically Clear Transparent Objects

 

■ Development of technology to produce transparent objects by Inkjet printing

    ■ Material: ORMOCER® OC-D7 (printable by inkjet, low solvent content)

    ■ Reached shape accuracy:

            -  side angle 85°± 1° (1s, Min 81°, Max. 88°)

            -  length variation ≈ +190±140 μm

            -  width variation ≈ +10±100 μm

            -  P-V ≈ 20 µm (top surface area)

            -  roughness ≈ 54 nm (top surface area)

 


Transmission Better Than 93 %

 

■ Improvement of transmission through plasma etching of Inkjet printed polymer-based optical components

    ■ Transmission > 93..95% (improvement by 2..3 % due to reduced reflection)

    ■ Add-on broadband antireflection property

 


Integration of Reflection and Scattering Elements by Laser

 

■ Integration of functionality (reflection and scattering of LED light) through printing technologies in Inkjet printed polymer-based optical components

    ■ Inkjet printing and plasma sintering of Ag nanoparticle based inks

    ■ Thickness of the printed Ag layer: 0.5 – 1 µm, typical reflectivity > 90 % (93 % at 532 nm); [reflectivity of bulk-silver = 95 %]

 


Integration of Luminescent Sources in Printed Transparent Objects

 

■ Integration of electronic components (LEDs) through hybrid assembly in Inkjet printed polymer-based optical components

    ■ hybrid assembly: Aerosol-Jet technology (jetting of Ag nanoparticles based inks, sinter temperatre 125 ° C, ORMOCER® compatible) + pick and place technology

    ■ Integrated LEDs: 15..80 mcd @ 10 mA, approx. 2 V, PV < 50 mW