Luminous performances characterization of YAG

Luminous performances characterization of YAG: Ce3+ phosphor/silicone composites using both reflective and transmissive laser excitations

Cao, Yixing (Fudan University)
Chen, Wei (Fudan University)
Du, Yunjia (Hohai University)
Qi, Gaojin (Hohai University)
Santos, Thebano (Renato Archer Information Technology Center)
Zhang, Kouchi (TU Delft Electronic Components, Technology and Materials)
Fan, J. (TU Delft Electronic Components, Technology and Materials; Fudan University)

2022

YAG: Ce3+ phosphor/silicone composites are widely used in solid-state lighting as a light converter to achieve white lighting. However, because of high thermal resistance and low thermal stability, the luminous performance of YAG: Ce3+ phosphor/silicone composite deteriorates rapidly when excited by high-power-density blue-laser. To explore the potential of blue laser-excited YAG: Ce3+ phosphor/silicone composites, the luminous performances under different blue laser power conditions were characterized by both the reflective and transmissive excitations using a self-built three-integrating-sphere system. Furthermore, the Monte-Carlo Ray-tracing simulation was used to illustrate the light-transmission and energy conversion mechanism in the phosphor/silicone composites. The results showed that: (1) The YAG: Ce3+ phosphor/silicone composite could be excited by the 0.292W laser light with the peak wavelength of 445nm, excessive laser power will cause phosphor thermal quenching and silicone carbonization. (2) The luminous flux of the composite under both the reflective and transmissive excitations gradually increased with the increase of phosphor concentration; correspondingly, the color coordinate moved to the yellow region, and the Correlated Color Temperature (CCT) gradually decreased. (3) The simulation results indicated that under the same phosphor concentration, the luminous flux obtained by reflection excitation was largely higher than that by the transmission excitation, as the light re-conversion and strong back-scattering were occurred in the reflective and transmissive laser excitation respectively.

Laser excitation
Light-emitting diode
Monte-Carlo Ray-tracing
Phosphor/silicone composites
YAG: Ce 3+

http://resolver.tudelft.nl/uuid:9e2c6867-76dc-4218-abaf-2c2b98ede20f

https://doi.org/10.1109/JPHOT.2022.3150517

1943-0655

IEEE Photonics Journal, 14 (2)

Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.

Institutional Repository

journal article

© 2022 Yixing Cao, Wei Chen, Yunjia Du, Gaojin Qi, Thebano Santos, Kouchi Zhang, J. Fan