In:
Dalton Transactions, Royal Society of Chemistry (RSC), Vol. 52, No. 35 ( 2023), p. 12470-12477
Abstract:
Most commercial phosphor-converted white light-emitting diodes (pc-WLEDs) are manufactured with blue LED chips and yellow-emitting Y 3 Al 5 O 12 :Ce 3+ (YAG:Ce 3+ ) garnet phosphor, but the lack of blue-green light in the spectrum results in a low color rendering index (CRI). In this paper, we synthesized Y 3 ScAl 4 O 12 :Ce 3+ (YSAG:Ce 3+ ) by replacing Al 3+ in YAG:Ce 3+ with Sc 3+ . The introduction of Sc 3+ with a larger ionic radius through a cation substitution strategy causes lattice expansion, elongation of the Y–O bond, and ultimately a decrease in Ce 3+ 5d level crystal field splitting. As a consequence, the emission spectrum undergoes a blue-shift of 10 nm. Furthermore, the YSAG:Ce 3+ phosphor exhibits good thermal stability, and its emission intensity at 423 K is about 58% of that at 303 K. Moreover, the analysis of Eu 3+ emission spectra demonstrates that the introduction of Sc 3+ resulted in a slight reduction of the dodecahedral lattice symmetry. YSAG:Ce 3+ effectively compensates for the lack of the blue-green region, and WLEDs with high color rendering index (90.1), low color temperature (4566 K) and high luminous efficiency (133.59 lm W −1 ) were prepared using the combination of YSAG:0.08Ce 3+ , CaAlSiN 3 :Eu 2+ and 450 nm blue chips. These findings indicate that YSAG:Ce 3+ garnet phosphor has potential to be used in high quality WLEDs.
Type of Medium:
Online Resource
ISSN:
1477-9226
,
1477-9234
Language:
English
Publisher:
Royal Society of Chemistry (RSC)
Publication Date:
2023
detail.hit.zdb_id:
1472887-4
