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SYNTHESIS OF ZnS PHOSPHOR PARTICLES IN EXOTHERMIC FRONTAL WAVES

机译:放热波峰中ZnS磷颗粒的合成

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In this study, temperature profiles and combustion velocities of a Zn + S system in the presence of sodium halide (SH) as an inert diluent were investigated by combining combustion experiments with the thermocouple measurement technique. Flammability limits were determined experimentally by determining the limiting concentrations of sodium halides for which combustion can be initiated and propagated throughout the reaction pellet. The limiting concentration of NaCl was found to be higher than those of NaF and Nal, indicating that NaCl might be a more effective diluent for the Zn + S system. All reaction mixtures were characterized by low combustion temperature in the range 800-1350 ℃ and burning velocities in the range of 0.024-0.095 cmls. Depending on the combustion temperature, this synthetic route provides single-phase modified zinc sulfide powders of sphalerite and wurtz-ite. ZnS samples doped with halogen ions (H~) produced sky-blue emission (470 nm) under 340 nm excitation. ZnS samples codoped with Mn~(2+) ions showed a red shift (588 nm) under 356 nm excitation. The relative emission intensity of ZnS:Mn~(2+) phosphor increased as much as 3 times in the NaF→ Nal→NaCl range.
机译:在这项研究中,通过将燃烧实验与热电偶测量技术相结合,研究了在存在卤化钠(SH)作为惰性稀释剂的情况下Zn + S系统的温度曲线和燃烧速度。通过确定卤化钠的极限浓度,通过实验确定可燃性极限,对于该浓度,卤化钠可以引发并在整个反应颗粒中扩散。发现NaCl的极限浓度高于NaF和Nal的极限浓度,这表明NaCl可能是Zn + S系统更有效的稀释剂。所有反应混合物的特征是燃烧温度在800-1350℃范围内,燃烧速度在0.024-0.095 cmls范围内。根据燃烧温度,该合成路线可提供闪锌矿和纤锌矿的单相改性硫化锌粉末。掺有卤素离子(H〜)的ZnS样品在340 nm激发下产生天蓝色发射(470 nm)。掺有Mn〜(2+)离子的ZnS样品在356 nm激发下显示出红移(588 nm)。在NaF→Nal→NaCl范围内,ZnS:Mn〜(2+)荧光粉的相对发射强度增加了3倍。

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