Yellow phosphorous is an important raw material in the chemical industry. However, during the production of yellow phosphorous, high concentrations of carbon monoxide and other impurities are released. Without appropr...Yellow phosphorous is an important raw material in the chemical industry. However, during the production of yellow phosphorous, high concentrations of carbon monoxide and other impurities are released. Without appropriate purification and removal, this off gas has potential to cause severe pollution problems once released. Purified yellow phosphorous off gas can be beneficially reused as a raw material in chemical production for synthesis of high value-added chemical reagents. In this paper, the significance of purification and reutilization of yellow phosphorous off gas are explored. The principles, processes, and main characteristics of the technologies for purification and reuse of yellow phosphorus off gas （including technical measurements of impurity reduction, relevant engineering cases, and public acceptance of the technologies） are summarized. In view of the existing problems and scientific development require- ments, this paper proposes green production based several recommendations for on the concept of recycle economics. We conclude that advanced purification and comprehensive reutilization can be an effective solution for heavy pollution resulting from yellow phosphorous off gassing.展开更多
Eu2＋ and Dy3＋ codoped （Ca, Sr）7（SiO3）6C12 yellow phosphors were successfully synthesized by self-flux method. The structure, morphology and photoluminescence properties were investigated by X-ray diffraction （...Eu2＋ and Dy3＋ codoped （Ca, Sr）7（SiO3）6C12 yellow phosphors were successfully synthesized by self-flux method. The structure, morphology and photoluminescence properties were investigated by X-ray diffraction （XRD）, scanning electron microscopy （SEM） and photoluminescence spectra. The as-prepared phosphor showed a broad emission spectrum centered at 550 nm for Eu2＋ single-doped phosphor, while located at 548 544 nm for the Eu2＋, Dy3＋ codoped samples under excitation at 380 nm light. The emission intensity was greatly improved when Dy3＋ was doped into the （Ca,Sr）7（SiO3）6C12：Eu2＋ system. The composition-optimized sample with 3 mol.% of Dy3＋ and constant 10 tool.% of Eu2＋ exhibited a 220% PL enhancement compared to the phosphor with 10 tool.% Eu2＋ single-doped. Meanwhile, it was found that the quantum efficiency of phosphor namely （Ca,Sr）7（SiO3）6Cl2：3 tool.% Dy3＋ 10 mol.% Euz＋ could get up to 24.6%. The synthesized yellow-emitting （Ca,Sr）7（SiO3）6C12：Dy3＋,Eu2＋ is a promising candidate as high-efficiency yellow phosphor for NUV-excited white LEDs.展开更多
采用高温固相法制备了一系列黄橙光荧光粉Sr_(9)Mg_(1.5)(PO_(4))_(7-x)(BO_(3))_(x):0.05Eu^(2+)(SMPB_(x)O:Eu^(2+),x=0~0.6)和Sr_(9-2 y)Ca_(y)Ba_(y)Mg_(1.5)(PO_(4))_(7):0.05Eu^(2+)(SC_(y)B_(y)MPO:Eu^(2+),y=0~1.0),并对其发光...采用高温固相法制备了一系列黄橙光荧光粉Sr_(9)Mg_(1.5)(PO_(4))_(7-x)(BO_(3))_(x):0.05Eu^(2+)(SMPB_(x)O:Eu^(2+),x=0~0.6)和Sr_(9-2 y)Ca_(y)Ba_(y)Mg_(1.5)(PO_(4))_(7):0.05Eu^(2+)(SC_(y)B_(y)MPO:Eu^(2+),y=0~1.0),并对其发光性能的调控进行了研究。所得荧光粉可以被蓝光和近紫外光有效激发,并发射黄橙光(450~800 nm)。随着(BO_(3))^(3-)与Ca^(2+)-Ba^(2+)共掺浓度的改变,可以调节Eu^(2+)发光中心在Sr31、Sr1和Sr32格位中的选择性占据,从而改变SMPB_(x)O:Eu^(2+)和SC y B y MPO:Eu^(2+)的发射光谱。因此,固定激发波长,改变(BO_(3))3-或Ca^(2+)-Ba^(2+)共掺浓度可以实现对SMPB_(x)O:Eu^(2+)(x=0.2~0.6)和SC_(y)B_(y)MPO:Eu^(2+)(y=0.25~1.0)发光颜色的调控。另外,SMPB_(x)O:Eu^(2+)和SC_(y)B_(y)MPO:Eu^(2+)的发光颜色也可以通过改变激发波长来进行调控。此外,(BO_(3))^(3-)掺杂与Ca^(2+)-Ba^(2+)共掺均可以明显提高荧光粉的热稳定性。在100℃下,SMPB_(x)O:Eu^(2+)(x=0.2~0.6)和SC_(y)B_(y)MPO:Eu^(2+)(y=0.25~1.0)样品的发光强度均可达到其各自初始强度的60%以上。展开更多
Phosphor-converted white light-emitting diodes for indoor illumination need to be warm-white(i.e.,correlated color temperature,4000 K)with good color rendition(i.e.,color rendering index.80).However,no single-phosphor...Phosphor-converted white light-emitting diodes for indoor illumination need to be warm-white(i.e.,correlated color temperature,4000 K)with good color rendition(i.e.,color rendering index.80).However,no single-phosphor,single-emitting-center-converted white light-emitting diodes can simultaneously satisfy the color temperature and rendition requirements due to the lack of sufficient red spectral component in the phosphors’emission spectrum.Here,we report a new yellow Ba_(0.93)Eu_(0.07)Al_(2)O_(4) phosphor that has a new orthorhombic lattice structure and exhibits a broad yellow photoluminescence band with sufficient red spectral component.Warm-white emissions with correlated color temperature,4000 K and color rendering index.80 were readily achieved when combining the Ba_(0.93)Eu_(0.07)Al_(2)O_(4) phosphor with a blue light-emitting diode(440–470 nm).This study demonstrates that warm-white light-emitting diodes with high color rendition(i.e.,color rendering index.80)can be achieved based on single-phosphor,single-emitting-center conversion.展开更多
文摘Yellow phosphorous is an important raw material in the chemical industry. However, during the production of yellow phosphorous, high concentrations of carbon monoxide and other impurities are released. Without appropriate purification and removal, this off gas has potential to cause severe pollution problems once released. Purified yellow phosphorous off gas can be beneficially reused as a raw material in chemical production for synthesis of high value-added chemical reagents. In this paper, the significance of purification and reutilization of yellow phosphorous off gas are explored. The principles, processes, and main characteristics of the technologies for purification and reuse of yellow phosphorus off gas （including technical measurements of impurity reduction, relevant engineering cases, and public acceptance of the technologies） are summarized. In view of the existing problems and scientific development require- ments, this paper proposes green production based several recommendations for on the concept of recycle economics. We conclude that advanced purification and comprehensive reutilization can be an effective solution for heavy pollution resulting from yellow phosphorous off gassing.
基金Project supported by Shanghai Education Committee Research Project(08YZ166,11YZ222)Shanghai Science and Technology Committee Project(09530500800)National Natural Science Foundation of China(51002096)
文摘Eu2＋ and Dy3＋ codoped （Ca, Sr）7（SiO3）6C12 yellow phosphors were successfully synthesized by self-flux method. The structure, morphology and photoluminescence properties were investigated by X-ray diffraction （XRD）, scanning electron microscopy （SEM） and photoluminescence spectra. The as-prepared phosphor showed a broad emission spectrum centered at 550 nm for Eu2＋ single-doped phosphor, while located at 548 544 nm for the Eu2＋, Dy3＋ codoped samples under excitation at 380 nm light. The emission intensity was greatly improved when Dy3＋ was doped into the （Ca,Sr）7（SiO3）6C12：Eu2＋ system. The composition-optimized sample with 3 mol.% of Dy3＋ and constant 10 tool.% of Eu2＋ exhibited a 220% PL enhancement compared to the phosphor with 10 tool.% Eu2＋ single-doped. Meanwhile, it was found that the quantum efficiency of phosphor namely （Ca,Sr）7（SiO3）6Cl2：3 tool.% Dy3＋ 10 mol.% Euz＋ could get up to 24.6%. The synthesized yellow-emitting （Ca,Sr）7（SiO3）6C12：Dy3＋,Eu2＋ is a promising candidate as high-efficiency yellow phosphor for NUV-excited white LEDs.
文摘采用高温固相法制备了一系列黄橙光荧光粉Sr_(9)Mg_(1.5)(PO_(4))_(7-x)(BO_(3))_(x):0.05Eu^(2+)(SMPB_(x)O:Eu^(2+),x=0~0.6)和Sr_(9-2 y)Ca_(y)Ba_(y)Mg_(1.5)(PO_(4))_(7):0.05Eu^(2+)(SC_(y)B_(y)MPO:Eu^(2+),y=0~1.0),并对其发光性能的调控进行了研究。所得荧光粉可以被蓝光和近紫外光有效激发,并发射黄橙光(450~800 nm)。随着(BO_(3))^(3-)与Ca^(2+)-Ba^(2+)共掺浓度的改变,可以调节Eu^(2+)发光中心在Sr31、Sr1和Sr32格位中的选择性占据,从而改变SMPB_(x)O:Eu^(2+)和SC y B y MPO:Eu^(2+)的发射光谱。因此,固定激发波长,改变(BO_(3))3-或Ca^(2+)-Ba^(2+)共掺浓度可以实现对SMPB_(x)O:Eu^(2+)(x=0.2~0.6)和SC_(y)B_(y)MPO:Eu^(2+)(y=0.25~1.0)发光颜色的调控。另外,SMPB_(x)O:Eu^(2+)和SC_(y)B_(y)MPO:Eu^(2+)的发光颜色也可以通过改变激发波长来进行调控。此外,(BO_(3))^(3-)掺杂与Ca^(2+)-Ba^(2+)共掺均可以明显提高荧光粉的热稳定性。在100℃下,SMPB_(x)O:Eu^(2+)(x=0.2~0.6)和SC_(y)B_(y)MPO:Eu^(2+)(y=0.25~1.0)样品的发光强度均可达到其各自初始强度的60%以上。
基金ZWP acknowledges funding by the US National Science Foundation(CAREER DMR-0955908)ZJG acknowledges support by the National Basic Research Programs of China(973 program,No.2012CB932504)+4 种基金JDB was supported by the Materials Sciences and Engineering Division,Office of Basic Energy Sciences(BES),US Department of Energy(DOE).Use of the APS beamline 11-BM-B for synchrotron X-ray powder diffractionbeamline 34-ID-E for polychromatic Laue microdiffraction was supported by the Scientific User Facilities Division of BES,US DOE.Use of the APS beamline 20-BM-B for X-ray absorption near edge structure measurement by CJS was supported by US DOE under Contract no.DE-AC02-06CH11357 with Argonne National Laboratory.The TEM characterization was sponsored by Oak Ridge National Laboratory’s Shared Research Equipment(ShaRE)User program,which is sponsored by the Division of Scientific User Facilities of BES,US DOE.
文摘Phosphor-converted white light-emitting diodes for indoor illumination need to be warm-white(i.e.,correlated color temperature,4000 K)with good color rendition(i.e.,color rendering index.80).However,no single-phosphor,single-emitting-center-converted white light-emitting diodes can simultaneously satisfy the color temperature and rendition requirements due to the lack of sufficient red spectral component in the phosphors’emission spectrum.Here,we report a new yellow Ba_(0.93)Eu_(0.07)Al_(2)O_(4) phosphor that has a new orthorhombic lattice structure and exhibits a broad yellow photoluminescence band with sufficient red spectral component.Warm-white emissions with correlated color temperature,4000 K and color rendering index.80 were readily achieved when combining the Ba_(0.93)Eu_(0.07)Al_(2)O_(4) phosphor with a blue light-emitting diode(440–470 nm).This study demonstrates that warm-white light-emitting diodes with high color rendition(i.e.,color rendering index.80)can be achieved based on single-phosphor,single-emitting-center conversion.
