有色的
白光
寄主(生物学)
材料科学
化学
光电子学
生物
生态学
复合材料
作者
Shreya Sasmal,Srinivasan Natarajan
标识
DOI:10.1002/asia.202500500
摘要
The compound, Sr2Zn3Te2P2O14, was explored as a host to prepare new, brightly colored compounds and rare-earth ions based white light emission. All the compounds were synthesized at 750-880°C in air and characterized. The structure has Zn2+ ions in both tetrahedral as well as distorted square planar coordination. The substitution of transition elements such as Co2+, Ni2+, and Cu2+ ions in place of Zn2+ ions results in compounds exhibiting bright colors under daylight. The studies indicated that the Cu2+ ions prefer square-planar geometry, which was supported by UV-visible, EPR, and Raman spectroscopic studies. The substitution of P5+ ions by V5+ ions along with transition elements in place of Zn2+ ions results in compounds with different colors. The change in color is due to the metal-to-metal charge transfer (MMCT) transitions involving partially filled 3dn electrons of the transition elements and empty 3d0 orbitals of V5+ ions. The near-IR reflectivity studies indicate that the white-colored compounds exhibit good near-IR reflectivity behavior, that are comparable to TiO2. The substitution of rare-earth ions, namely, Eu3+, Tb3+, and Tm3+ ions in place of 8-coordinated Sr2+ ions results in characteristic emissions in the red, green, and blue regions, respectively. A careful manipulation of the concentration of these three ions (Eu3+, Tb3+, and Tm3+) resulted in white light emission for the composition Sr2Zn3Te2P2O14: 1%Tm, 2% Tb, and 3% Eu. Based on the lifetime measurements, a possible schematic of the energy transfer pathway has also been proposed. The white-colored compounds exhibited reasonable dielectric constant values with low dielectric loss. Magnetic studies indicate anti-ferromagnetic interactions. The present study suggests that the telluro-phosphate compounds could be good candidates to explore many different physical and chemical properties.
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