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Journal Article

Narrow-band red-emitting Sr[LiAl3N4]:Eu2+ as a next-generation LED-phosphor material

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Pust, P., Weiler, V., Hecht, C., Tücks, A., Wochnik, A. S., Henß, A.-K., et al. (2014). Narrow-band red-emitting Sr[LiAl3N4]:Eu2+ as a next-generation LED-phosphor material. Nature Materials, 13(9), 891-896. doi:10.1038/NMAT4012.

Cite as: https://hdl.handle.net/11858/00-001M-0000-0024-B8A1-6
To facilitate the next generation of high-power white-light-emitting diodes (white LEDs), the discovery of more efficient red-emitting phosphor materials is essential. In this regard, the hardly explored compound class of nitridoaluminates affords a new material with superior luminescence properties. Doped with Eu2+, Sr[LiAl3N4] emerged as a new high-performance narrow-band red-emitting phosphor material, which can efficiently be excited by GaN-based blue LEDs. Owing to the highly efficient red emission at lambda(max) similar to 650 nm with a full-width at half-maximum of similar to 1,180 cm(-1) (similar to 50 nm) that shows only very low thermal quenching (>95% relative to the quantum efficiency at 200 degrees C), a prototype phosphor-converted LED (pc-LED), employing Sr[LiAl3N4]:Eu2+ as the red-emitting component, already shows an increase of 14% in luminous efficacy compared with a commercially available high colour rendering index (CRI) LED, together with an excellent colour rendition (R(a)8 = 91, R9 = 57). Therefore, we predict great potential for industrial applications in high-power white pc-LEDs.