Luminescence characteristics of Eu2+-activated white-emitting phosphor prepared from solar cell cutting Si powder
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摘要: 以单晶硅太阳能电池切削产生的硅泥为原料，通过氨氮化工艺高温烧结制备了Eu2+激发的直接白光荧光粉，研究了Eu2+掺杂浓度对荧光粉发光性能的影响.物相分析结果显示，所合成的荧光粉为混合物，主要晶相为Ca2SiO4、CaSiO3和Ca2Si5N8.通过分析荧光光谱，发现荧光粉的有效激发范围为300~450 nm.在370nm近紫外光激发下，荧光粉中主要存在两个发光中心，分别位于470nm和570 nm，发光颜色趋近于白光，色坐标为（0.327 5，0.386 6），色温为5705 K（5 431.85℃）.通过改变Eu离子掺杂浓度发现：荧光粉发光强度先增大后减小，最佳Eu2+掺杂量为10.0 mol%；超过最佳掺杂浓度，由于离子间的相互作用导致浓度淬灭.通过单一荧光粉配合紫外芯片激发可直接获得白光输出.Abstract: Eu2+-activated white-emitting phosphors were synthesized by the process of ammonia nitridation at high temperature with the raw material of silicon powder from crystalline silicon solar cells cutting sludge. The effect of Eu2+ doping concentrations on structural and luminescent properties of phosphors was studied in detail. It turns out that the principal crystalline phase of the sample is the mixture of Ca2SiO4, CaSiO3 and Ca2Si5N8. These phosphors can be effectively excited in the range of 300~450 nm, showing intense absorption in ultraviolet to near-ultraviolet region. In addition, they exhibit intense white emissions with CIE (Commission Internationale de L'Eclairage) coordinates of (0.327 5, 0.386 6) under 370 nm excitation with color temperature of 5 705 K(5 431.85℃). There are two luminescence centers in the host, which locate at 470 nm and 570 nm, respectively. With the increase of the doping concentration of Eu2+, the emission reaches an intensity saturation and the optimum doping content of Eu2+ is 10.0 mol% due to the interaction among the activator ions which result in an concentration quenching. Using such a single phosphor, a white light output can be directly achieved combined with UV chip.
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Key words:
- ammonia nitridation /
- Eu2+ doping /
- nitride phoshor /
- white LED
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图 4 10.0 mol% Eu$^{2+}$掺杂荧光粉的SEM图
Fig. 4 The SEM image of 10.0 mol% Eu$^{2+}$ doped phosphor
图 6 不同激发波长下10.0 mol% Eu$^{2+}$掺杂浓度荧光粉的发射光谱
Fig. 6 Emission spectra of 10.0 mol% Eu$^{2+}$ doped phosphor with different excitation factors
图 7 10.0 mol% Eu$^{2+}$掺杂浓度荧光粉在470 nm和570 nm处的激发光谱
Fig. 7 Excitation spectra of 10.0 mol% Eu$^{2+}$ doped phosphor monitored at 470 nm and 570 nm emissions
图 9 10.0 mol% Eu$^{2+}$荧光粉变温发射光谱
Fig. 9 Temperature dependent emission spectra of 10.0 mol% Eu$^{2+}$ doped phosphor
图 10 10.0 mol% Eu$^{2+}$荧光粉发射强度与温度的关系曲线
Fig. 10 Temperature-dependent emission intensity versus temperature of 10.0 mol% Eu$^{2+}$ doped phosphor
表 1 单晶硅太阳能电池硅泥的组成
Tab. 1 The composition of silicon powder from monocrystalline silicon solar cells
Element Conc/% C 5.770 N 5.229 O 2.766 Si 85.561 S 0.675 H 0.000 
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表 2 荧光粉各个组成的点阵参数表
Tab. 2 Lattice parameters for the compounds of the phosphor
Concentration Space group $a$/Å $b$/Å $c$/Å Density Ca$_{2}$Si$_{5}$N$_{8}$ Cc(9) 14.352 5.610 9.689 3.055 5.0 mol% Eu$^{2+}$ Cc(9) 14.345 5.600 9.685 3.063 10.0 mol% Eu$^{2+}$ Cc(9) 14.378 5.603 9.721 3.048 15.0 mol% Eu$^{2+}$ Cc(9) 14.331 5.594 9.690 3.068 Ca$_{2}$SiO$_{4}$ P21/n(14) 9.310 6.756 5.506 3.280 5.0 mol% Eu$^{2+}$ P21/n(14) - - - - 10.0 mol% Eu$^{2+}$ P21/n(14) 9.327 6.769 5.493 3.319 15.0 mol% Eu$^{2+}$ P21/n(14) 9.295 6.678 5.542 3.291 CaSiO$_{3}$ C-1(2) 10.104 11.054 7.305 3.070 5.0 mol% Eu$^{2+}$ C-1(2) - - - - 10.0 mol% Eu$^{2+}$ C-1(2) 10.127 11.066 7.282 2.935 15.0 mol% Eu$^{2+}$ C-1(2) 10.160 11.004 7.299 2.940
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