Laser-driven white light generation by mixing blue (BAM), green (GYAG), and red (nitride) phosphors

Dimitrios Kyrginas (1, 2) , Gérald Ledru (1) , Benoit Glorieux (3) , Georges Zissis (1)

1 LAPLACE-LM - Lumière et Matière
2 LAPLACE - LAboratoire PLasma et Conversion d'Energie
3 ICMCB - Institut de Chimie de la Matière Condensée de Bordeaux

In the present work, a purple laser diode of 405 nm is employed for the excitation of different types of phosphors for thepurpose of building a white light source. Three different types of phosphor materials were synthesized – a blue phosphor(BAM), a green phosphor (GYAG) and a red phosphor based on nitride. These samples were synthesized in the form ofsilicone pellets, having different thicknesses and different concentrations in the silicone matrix. In this study, two differentapproaches were followed. First, the three different samples were stacked together in various combinations to study thecolorimetric parameters of the emitted converted light, particularly the correlated color temperature (CCT) and the colorrendering index (CRI). In the second approach, the three types of phosphors were merged in the same silicone pellet. Pelletswith different thickness and ratio of the three phosphors were prepared, and their CCT and CRI parameters were measuredunder laser excitation. In the first case, a CCT of 2264 K and a CRI of 74 were achieved while with the second approach, anaverage temperature of 4500 K and a CRI of 85 were reached. While the difference between the CRI values for both cases isnot big, the CCT value of the mixed samples is twice as high as the value of the stacked pellets, something attributed tosimultaneous excitation of phosphors in mixed samples while, when stacked, each material is irradiated in a specific order.

Domaines: Optique / photonique

Dimitrios Kyrginas, Gérald Ledru, Benoit Glorieux, Georges Zissis. Laser-driven white light generation by mixing blue (BAM), green (GYAG), and red (nitride) phosphors. Light-Emitting Devices, Materials, and Applications XXVI, Jan 2022, San Francisco, United States. 56 / 120220O (5 p.), ⟨10.1117/12.2606554⟩. ⟨hal-03599252⟩