Single-phased silicate-hosted phosphor with 660 nm-featured band emission for biological light-emitting diodes
A single-phased (Ba,Sr) 3 MgSi 2 O 8 :Eu 2+ , Mn 2+ phosphor with 660 nm-featured dual band-emission is investigated upon optimizing composition to simulate the artificial photosynthetic action spectrum (PAS) for near-ultraviolet (NUV) biological light-emitting diodes (bio-LEDs). A specific composition range in Ba–Sr binary solid solution of (Ba,Sr) 3 MgSi 2 O 8 is found to be capable of obtaining single-phased host in the absence of an easily formed orthosilicate impurity, leading to a 660 nm-featured red band emission of Mn 2+ induced by an efficient energy transfer from a co-doped blue-emitting Eu 2+ sensitizer. This dual broad band emission phosphor has a 72 nm full width at half maximum (FWHM) for red band that covers fairly well to the absorption spectrum of chlorophyll and PAS for most plants, enabling a flexible option in the application of bio-illumination for artificial photosynthesis.
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