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Red emission generation through highly efficient energy transfer from Ce3+ to Mn2+ in CaO for warm white LEDs
Erscheinungsjahr
2016-01
Quelle
Alma/SFX Local Collection
Beschreibungen/Notizen
CaO:Ce
3+
,Mn
2+
phosphors with various Mn
2+
concentrations were synthesized by a solid state reaction method. Efficient energy transfer from Ce
3+
to Mn
2+
was observed and it allows the emission color of CaO:Ce
3+
,Mn
2+
to be continuously tuned from yellow (contributed by Ce
3+
) to red (by Mn
2+
) with an increase in Mn
2+
concentration and upon blue light excitation. The red emission becomes dominant when the Mn
2+
concentration is ≥0.014 with an energy transfer efficiency higher than 87% which can reach as high as 94% for a Mn
2+
concentration of only 0.02. A critical distance of 10.5 Å for the Ce
3+
-Mn
2+
energy transfer was determined. A faster decrease of Ce
3+
luminescence intensity in comparison with its lifetime was observed on increasing the Mn
2+
concentration. The analysis of this feature reveals that the Ce
3+
excitation energy can be completely transferred to Mn
2+
if the Ce
3+
-Mn
2+
distance is shorter than 7.6 Å. A warm white LED was fabricated through integrating an InGaN blue LED chip and a blend of two phosphors (YAG:Ce
3+
yellow phosphor and CaO:0.007Ce
3+
,0.014Mn
2+
red phosphor) into a single package, which has CIE chromaticity coordinates of (
x
= 0.37,
y
= 0.35), a correlated color temperature of 3973 K and a color rendering index of 83.1. The results indicate that CaO:Ce
3+
,Mn
2+
may serve as a potential red phosphor for blue LED based warm white LEDs.
Red emission generation and application through efficient energy transfer from Ce
3+
to Mn
2+
in CaO.
Sprache
–
Identifikatoren
ISSN: 1477-9226
eISSN: 1477-9234
DOI: 10.1039/c5dt04341g
Titel-ID: cdi_rsc_primary_c5dt04341g
Format
–
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