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Communication Dans Un Congrès Année : 2018

Lanthanide-free amorphous aluminum-borate micropowders: Broadband emitting phosphors for warm-white LED lighting

Résumé

We develop original phosphors based on glassy aluminum borate micropowders without any metal activator for the development of eco-efficient white-LEDs. Thus, these lanthanide-free phosphors allow producing intense photoluminescence broadbands in the whole visible range from carbon-related radicals trapped in glassy grains. The origin of emitting centers has been specified by coupling microcalorimetry, mass spectrometry, thermo- and afterglow-luminescence, NMR, EPR and pulsed ENDOR spectroscopies combined with DFT calculations. Thus, from only one phosphor excited with near-UV LED chips (365-390 nm), we can generate intense warm white light: internal quantum yields around 80-90% and high color rendering indexes (CRI = 92-94).
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Dates et versions

hal-02002113 , version 1 (31-01-2019)

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  • HAL Id : hal-02002113 , version 1

Citer

Mathieu Salaun, Atul D. Sontakke, Vincent Maurel, Michel Bardet, Jean-Marie Mouesca, et al.. Lanthanide-free amorphous aluminum-borate micropowders: Broadband emitting phosphors for warm-white LED lighting. SPIE Photonics West, SPIE, Jan 2018, San Francisco, United States. ⟨hal-02002113⟩
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