LIU Yan-hua, BAI Wen-xia, GENG Zhong-rong etc. Near-infrared Quantum Cutting of Sr<sub>3</sub>Al<sub>2</sub>O<sub>6</sub>: Tb<sup>3+</sup>, Yb<sup>3+</sup> Phosphors[J]. Chinese Journal of Luminescence, 2017,38(4): 423-429
LIU Yan-hua, BAI Wen-xia, GENG Zhong-rong etc. Near-infrared Quantum Cutting of Sr<sub>3</sub>Al<sub>2</sub>O<sub>6</sub>: Tb<sup>3+</sup>, Yb<sup>3+</sup> Phosphors[J]. Chinese Journal of Luminescence, 2017,38(4): 423-429 DOI: 10.3788/fgxb20173804.0423.
Near-infrared Quantum Cutting of Sr3Al2O6: Tb3+, Yb3+ Phosphors
The mismatch between band gap of silicon cell and solar spectra results in serious loss of energy
which greatly reduces the efficiency of silicon solar cell. In order to decrease the loss of incident photons like ultraviolet (UV) photons
the photoluminescence materials with near-infrared (NIR) quantum cutting (QC) effect can be used as spectra transformation materials to enhance the efficiency of silicon solar cells. As a novel kind of efficient NIR quantum cutting material
Sr
3
Al
2
O
6
:Tb
3+
Yb
3+
phosphors promising for silicon solar cells were successfully prepared using sol-gel method. The luminescence properties of Sr
3
Al
2
O
6
:Tb
3+
Yb
3+
were investigated using photoluminescence (PL) spectra and decay lifetime curves. The results show that the phosphors can emit visible light of Tb
3+
:
5
D
4
7
F
j
under the excitation of 320 nm
while NIR light is emitted by Yb
3+
:
7
F
5/2
7
F
7/2
through cooperative energy transfer from one Tb
3+
ion to two Yb
3+
ions. Decay lifetimes of Tb
3+
and quantum efficiency (QE) were studied for Sr
3
Al
2
O
6
:Tb
3+
and Sr
3
Al
2
O
6
:Tb
3+
Yb
3+
. The results show that there is effective cooperative energy transfer from Tb
3+
to Yb
3+
in which maximum energy transfer efficiency (ETE) and the corresponding quantum efficiency are estimated to be 35.9% and 135.9%
respectively. The results demonstrate that Sr
3
Al
2
O
6
:Tb
3+
Yb
3+
phosphors are promising candidate for improving the efficiency of silicon based solar cell by means of down-conversion.
关键词
Keywords
references
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