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NBBO_green.pdf (835.66 kB)
Controlling Eu2+ Substitution towards a Narrow-Band Green-Emitting Borate Phosphor NaBaB9O15:Eu2+
Preprints are manuscripts made publicly available before they have been submitted for formal peer review and publication. They might contain new research findings or data. Preprints can be a draft or final version of an author's research but must not have been accepted for publication at the time of submission.
submitted on 31.10.2019 and posted on 06.11.2019by Ya Zhuo, Jiyou Zhong, Jakoah Brgoch
Highly efficient, thermally stable, narrow-band phosphors that can be
excited by a blue LED chip are crucial for energy-efficient light bulbs and
display lighting. Here, a rare narrow-band, green-emitting phosphor based on
the compound NaBaB9O15:Eu2+ is demonstrated.
The emission peak is centered at 515 nm with a full-width at half-maximum
(fwhm) of 61 nm (2294 cm−1), and a photoluminescence quantum yield
of >80% using blue or near-UV LED excitation. This borate’s remarkable green
emission stems from Eu2+ substituting on the smaller [NaO6]
polyhedron instead of the larger and more favorable [BaO9]
polyhedron. The phosphor also exhibits negligible thermal quenching up to 650 K
owing to the wide band gap, high connectivity of the rigid NaBaB9O15
crystal structure, and the depopulation of trap-states. This combination of
optical properties and its straightforward synthesis conditions makes NaBaB9O15:Eu2+
an ideal green phosphor for next-generation LED-based lighting or display