A Novel White Light Emitting Long-lasting Phosphor

A Novel White Light Emitting Long-lasting Phosphor
the indigo blue light (410 nm) in the CdSiO3:Dy 3+ phosphor. There are two prominent
peaks in the emission spectrum of the Dy 3+ doped CdSiO3 phosphor besides broad band,
which can be attributed to the electrical transition of Dy 3+ , 4 F9/2→ 6 H13/2 for 580 nm and
4 F9/2→ 6 H15/2 for 486 nm, respectively 10 . It is clear from the photoluminescence spectra
that in the Dy 3+ doped CdSiO3 phosphor, energy transfer from the host to the Dy 3+
activator ions occur. When illuminated by the excitation source, excitation energy is
absorbed by the host and created the trap emission (the 410 nm broad band), meanwhile,
the absorbed energy is transferred to the Dy 3+ ion and created the typical emissions of
Dy 3+ .
Figure 1 Emission spectrum (b) and excitation spectrum (a) of 5% Dy 3+ -doped
CdSiO3 phosphor
Intensity (a.u)
2200
2000
1800
1600
1400
1200
1000
800
600
400
200
0
The inset is the photoluminescence spectrum of undoped CdSiO 3 sample
Figure 2 The CIE chromaticity diagram of the 5% Dy 3+ doped CdSiO 3 phosphor
y
100 200 300 400 500 600 700 800 900
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
520
510
505
a b
500
495
490
530
540
550
560
600
610
620
680
~980
0.2
0.1
485
480
0
470
460
0.1
380~410
0.2 0.3 0.4
x
0.5 0.6 0.7 0.8
In general, colors are represented by color coordinate and color ratio. Figure 2
shows the color coordinates of 5% Dy 3+ doped CdSiO3 phosphor in CIE chromaticity
diagram. The region within the Figure 2 corresponds to white light color coordinates 11 .
Intensity (a.u)
Wavelength (nm)
570
2000
1500
1000
500
0
a
200 300 400 500 600 700
Wavelength (nm)
580
590
b
337