荧光粉
发光二极管
材料科学
光电子学
发光效率
二极管
发光
量子效率
显色指数
纳米技术
图层(电子)
作者
Philipp Pust,Volker Weiler,Cora Hecht,Andreas Tücks,Angela S. Wochnik,Ann‐Kathrin Henß,D.U. Wiechert,Christina Scheu,Peter J. Schmidt,Wolfgang Schnick
出处
期刊:Nature Materials
[Springer Nature]
日期:2014-06-22
卷期号:13 (9): 891-896
被引量:1226
摘要
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 Eu(2+), 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 λ(max) ~ 650 nm with a full-width at half-maximum of ~1,180 cm(-1) (~50 nm) that shows only very low thermal quenching (>95% relative to the quantum efficiency at 200 °C), a prototype phosphor-converted LED (pc-LED), employing Sr[LiAl3N4]:Eu(2+) 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.
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