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Light recycling in LED-pumped Ce:YAG luminescent concentrators

Abstract : We report the development of a high-brightness, high-power Ce:YAG luminescent concentrator pumped by 2240 blue LEDs in quasi-continuous wave operation (10 µs, 10 Hz). Using light confinement and recycling in the three space dimensions, the parallelepiped (1mm×14×mm×200mm) Ce:YAG emits a power of 145 W from a square output surface (1 × 1mm 2) corresponding to a brightness of 4.6 kW/cm 2 /sr. This broadband yellow source has a unique combination of luminous flux (7.6 10 4 lm) and brightness (2.4 10 4 cd/mm 2) and overcomes many other visible incoherent sources by one order of magnitude. This paper also proposes a deep understanding of the performance drop compared to a linear behavior when the pump power increases. Despite excited state absorption was unexpected for this low doped Ce:YAG pumped at a low irradiance level, we demonstrated that it affects the performance by tripling the losses in the concentrator. This effect is particularly important for small output surfaces corresponding to strong light recycling in the concentrator and to average travel distances inside the medium reaching meters.
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https://hal.archives-ouvertes.fr/hal-03298463
Contributor : Pierre Pichon Connect in order to contact the contributor
Submitted on : Friday, July 23, 2021 - 4:08:32 PM
Last modification on : Sunday, June 26, 2022 - 3:11:34 AM
Long-term archiving on: : Sunday, October 24, 2021 - 6:50:51 PM

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Maxime Nourry-Martin, P. Pichon, Frederic Druon, Stephane Darbon, Francois Balembois, et al.. Light recycling in LED-pumped Ce:YAG luminescent concentrators. Optics Express, Optical Society of America - OSA Publishing, 2021, 29 (16), pp.25302. ⟨10.1364/oe.433063⟩. ⟨hal-03298463⟩

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