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14 december 2018

Closed Industrial Partnership Programme



Title (code)

Improved solid-state light sources (SLS)

Executive organisational unit


Programme management

Prof.dr. J. Gómez Rivas



Cost estimate

M€ 1.1



Concise programme description

To generate fundamental knowledge needed to develop high-efficiency solid-state light sources. This programme focuses on improving the light conversion and outcoupling efficiency of phosphor layers that serve to convert the spectrally narrow bandgap emission from light emitting diodes (LEDs) to a desired broadband (white) output spectrum. This goal will be achieved by integrating photonic or plasmonic nanostructures with the phosphor layer.

Background, relevance and implementation
In this Industrial Partnership Programme, planning of fundamental research is done in clear relation with deliverables of applied projects defined at Philips Research, thereby further strengthening the partnership between Philips and FOM.
The programme will investigate the coupling of light to eigenmodes of nanostructured surfaces. This coupling will serve to improve light generation and extraction. In particular, the program focuses on two approaches: 1) coupling light to long-range surface polaritons sustained by ultra-thin dielectric films in contact with phosphor layers, and 2) coupling light to surface modes sustained by arrays of plasmonic antennas in contact with phosphor layers. In both cases, light is converted using phosphor layers that are 10-100 times thinner than in conventional designs. Such thinner layers are desired because of reduced cost and reduced thermal load. Also, the use of thinner phosphor layers provides more flexibility in the optical design of broadband solid-state LED sources. More efficient light coupling will also enable the use of organic phosphors that would otherwise suffer from degradation. As a further benefit, the coupling of phosphors to photonic nanostructures enables control over the emission efficiency, the angular emission pattern as well as the polarization of the emitted light.

A scientific advisory board is established that meets yearly, and monitors progress of the programme. A supervisory board oversees overall progress of the programme. Drastic changes require approval of the supervisory board.
The final evaluation of this programme consisted of a self-evaluation initiated by the programme leader and was done in 2015.