Efficient and thermally stable blue-emitting Ce³⁺ doped LaAl(Si_6−zAl_z)(N_10−zO_z) (JEM:Ce) phosphors for white LEDs

Efficient and thermally stable blue-emitting Ce³⁺ doped LaAl(Si_6−zAl_z)(N_10−zO_z) (JEM:Ce) phosphors for white LEDs

Wang, Chun Yun (Hokkaido University; National Institute for Materials Science)
ten Kate, O.M. (TU Delft ChemE/Product and Process Engineering; National Institute for Materials Science)
Takeda, Takashi (Hokkaido University; National Institute for Materials Science)
Hirosaki, Naoto (National Institute for Materials Science)

2017-07-15

La₂O₃, LaN, Si₃N₄, AlN and CeO₂ have been used as starting materials to synthesize Ce doped LaAl(Si_6−zAl_z)(N_10−zO_z) (z ≈ 1, termed the JEM phase) phosphors, via a solid-state reaction method in a gas pressure furnace at a high temperature. Nearly single phase JEM:Ce phosphors have been obtained by carefully controlling the synthesis conditions. The 5% Ce doped JEM phosphor displays a broad excitation band extending from UV to 425 nm, with a maximum at 355 nm. Excitation with 355 nm light results in a Ce³⁺ 5d–4f emission band (FWHM = 81 nm) centered at 430 nm, with a high internal quantum efficiency of 75%. The emission of the JEM:0.01Ce phosphor has only quenched 3% at room temperature as compared to the intensity at 4 K and still 57% of the luminescence is left at 573 K, which is superior to JEM:Eu phosphors. These performances make JEM:Ce phosphors very promising blue-emitting phosphors for white LED applications.

http://resolver.tudelft.nl/uuid:227c60c4-f286-4223-b7a2-c378b6c0fec0

https://doi.org/10.1039/C7TC01697B

2018-07-15

2050-7526

Journal of Materials Chemistry C: materials for optical and electronic devices, 32 (5), 8295--8300

Institutional Repository

journal article

© 2017 Chun Yun Wang, O.M. ten Kate, Takashi Takeda, Naoto Hirosaki