These are preliminary reports that have not been peer-reviewed. They should not be regarded as conclusive, guide clinical practice/health-related behavior, or be reported in news media as established information. For more information, please see our FAQs.
NBBO_green.pdf (835.66 kB)

Controlling Eu2+ Substitution towards a Narrow-Band Green-Emitting Borate Phosphor NaBaB9O15:Eu2+

submitted on 31.10.2019, 15:56 and posted on 06.11.2019, 21:55 by 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 systems.


Email Address of Submitting Author


University of Houston


United States

ORCID For Submitting Author


Declaration of Conflict of Interest

No conflict of interest.