Facile synthesis of single phase α-Zn2SiO4:Mn2+ phosphor via high-energy planetary ball milling and post-annealing method

Photoluminescent Properties of Red-emitting AlPO4:Cr3+ Phosphor for Plant Growth LEDs

“…For the annealed-at-1500 °C sample, with V= 352 Å 3 , Xc= 0.3 mol%, N= 2, the calculated Rc value is 32.74 Å, which is quite close to the previous Rc reported for Cr 3+ -doped phosphor [6,31,34,36,37]. This Rc value is much greater than the critical distance of 5 Å for an effective interaction of energy transfer mechanism, implying that the multipolar interaction is accounted for the phosphorus quenching [31,34,36,37]. In addition, there are three main types of the multipolar interactions: dipole-dipole, dipole-quadrupole, quadrupolequadrupole interactions [34,37].…”

“…In which, V is volume of the unit cell, Xc is the threshold of the Cr 3+ ions concentration when the PL intensity starts decreasing and N is the number of the unit cells. For the annealed-at-1500 °C sample, with V= 352 Å 3 , Xc= 0.3 mol%, N= 2, the calculated Rc value is 32.74 Å, which is quite close to the previous Rc reported for Cr 3+ -doped phosphor [6,31,34,36,37]. This Rc value is much greater than the critical distance of 5 Å for an effective interaction of energy transfer mechanism, implying that the multipolar interaction is accounted for the phosphorus quenching [31,34,36,37].…”

Polymer Thermal Treatment Production of Cerium Doped Willemite Nanoparticles: An Analysis of Structure, Energy Band Gap and Luminescence Properties

“…It was further observed that with the increase in the cerium ion concentration, the sample revealed densely packed particles of different irregular sizes appearing with strong necking between the neighbor particles. It is interesting to observe that the replacement of Ce 3+ ions for Zn ions in willemite structure might distort the particle sizes and shapes [ 25 , 56 ]. Similarly, the sample prepared with 4 and 5 mol% shows more heightened edge-connection of the particles.…”

“…Willemite has several prospective applications such as photonic devices [ 17 , 18 ], adsorbents [ 19 , 20 ], and laser crystal systems [ 21 , 22 ]. Willemite is also serving as a host material for guest ions like transitional metals or rare earth metals due to its ability to display a wide range of multicolors for luminescence devices [ 11 , 23 , 24 , 25 , 26 , 27 , 28 ]. For instance, the luminescence properties of rare earth ions (RE 3+ ) such as the longer emission lifetime, sharper luminescence array, and the characteristic spectral features (owed to their filled 4f shells and spared by the exterior 5s 2 and 5p 6 orbitals) are some of the exciting factors for choosing them in modern day optoelectronic applications.…”

The Influence of the Compositions of Reactants on the Luminescence Intensity of Zn2SiO4: Mn Synthesized by Sol-Gel Method Using Hydrochloric Acid

“…ISSN: 2734-9381 https://doi.org/10.51316/jst.148.etsd.2021.31.1.1 Received: September 26, 2019; accepted: August 5, 2020 Hiện nay ở Việt Nam và trên thế giới đã có rất nhiều công trình nghiên cứu tổng hợp kẽm silicat hoạt hóa bởi mangan với mục đích nâng cao chất lượng sản phẩm và hoàn thiện quy trình công nghệ. Để tổng hợp Zn2SiO4:Mn có nhiều phương pháp như: đồng kết tủa, thủy nhiệt, phản ứng pha rắn, sol-gel [4]... Phương pháp đồng kết tủa thường có nhược điểm là thành phần tỷ lượng của các kết tủa có thể không chính xác do một vài ion vẫn còn sót lại trong dung dịch. Phương pháp thủy nhiệt cần thực hiện ở nhiệt độ, áp suất khá cao.…”