KONG Li, GAN Shu-cai, HONG Guang-yan, ZHANG Ji-lin. Luminescence Properties of YAG:Ce Co-doped with Pr<sup>3+</sup> or Sm<sup>3+</sup>[J]. Chinese Journal of Luminescence, 2007,28(3): 393-396
KONG Li, GAN Shu-cai, HONG Guang-yan, ZHANG Ji-lin. Luminescence Properties of YAG:Ce Co-doped with Pr<sup>3+</sup> or Sm<sup>3+</sup>[J]. Chinese Journal of Luminescence, 2007,28(3): 393-396DOI:
Luminescence Properties of YAG:Ce Co-doped with Pr3+ or Sm3+
white light emitting diode (W-LED) has been widely applied in many areas. The common way to fabricate W-LED is by painting a yellow-emitting phosphor on the blue LED chip. Since blue LED emits from 430nm to 480nm
the absorption energy for a better yellow-emitting phosphor should match that spectral region of LED emission. YAG:Ce
3+
shows a strong broad band absorption around 465nm and emits at about 540nm; therefore it has been used as the main yellow-emitting phosphor in W-LED. However
the weakness of W-LED composed of blue LED and YAG:Ce
3+
is the shortage of its red-emission component. To overcome this weakness
one of the following approaches could be chosen: 1.Adding some red-emitting components into YAG:Ce
3+
phosphor; 2.Doping other cations in YAG:Ce
3+
lattice. Lanthanide ions are the appropriate ones for this doping YAG:Ce
3+
since their ionic radii are very close to that of Y
3+
ion. Many papers have reported the study on lanthanide doping. In this paper
the doping effects of Pr
3+
and Sm
3+
on the luminescence properties and fluorescence lifetime of YAG:Ce were systematically studied in order to understand the rule. Phosphors were synthesized by high-temperature solid-state reaction under reducing atmosphere. The X-ray diffraction patterns presented Pr
3+
and Sm
3+
can partially replace Y
3+
and the lattice phases do not change. The doping effects of Pr
3+
and Sm
3+
on the luminescence properties and fluorescence lifetimes of (Y
0.96-x
Ln
x
Ce
0.04
)
3
Al
5
O
12
(Ln= Pr
3+
Sm
3+
) were studied. The emission and excitation spectra of the samples are recorded. In the (Y
0.96-x
Pr
x
Ce
0.04
)
3
Al
5
O
12
system the emission band of Pr
3+
was at about 609nm; and in the (Y0.96-xSmxCe0.04)3Al5O12 system the emission band of Sm
3+
was at about 616nm. So it can increase the color rendering index (CRI) of YAG:Ce phosphors doped by Pr
3+
or Sm
3+
. Fluorescence lifetimes of the Ce
3+
in (Y
0.95
Pr
0.01
Ce
0.04
)
3
Al
5
O
12
(Y
0.95
Sm
0.01
Ce
0.04
)
3
Al
5
O
12
(Y
0.96
Ce
0.04
)
3
Al
5
O
12
are measured. The lifetime decreased due to the doping of Pr
3+
or Sm
3+
in YAG:Ce
3+
.
关键词
白光LEDYAG:Ce发射光谱掺杂
Keywords
W-LEDsYAG:Ceemission spectradoping
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