Tweaking the structure and symmetry of Y2B2O7:Eu3+ by B-site engineering for efficient and thermally stable phosphor: Y2Zr2O7 versus Y2Ge2O7

IF 5.3 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Research Bulletin Pub Date : 2024-08-10 DOI:10.1016/j.materresbull.2024.113039

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Abstract

There is an urgent need for synthesizing red emitting phosphor with high photoluminescence quantum yield (PLQY) and good thermal stability for high performing phosphor converted light emitting diodes (pc-LEDs) which are in demand to mitigate carbon emission. Here we have achieved the same through symmetry alteration and structural modification strategy which leads to high PLQY and improved thermal stability. In this work we have synthesized highly symmetric cubic fluorite Y₂Zr₂O₇:Eu³⁺pyrochlore and replacing the B-site Zr⁴⁺by Ge⁴⁺ to lower the symmetry and induce structural change to tetragonal Y₂Ge₂O₇:Eu³⁺ by organic solvent free solid state reactions. Among the three composition Y₂Ge₂O₇: Eu is exhibiting higher emission intensity, higher asymmetry ratio and enhanced PLQY (32.3 %) by virtue of lower symmetry of tetragonal phase. On the other hand, higher thermal stability was achieved for Y₂Zr₂O₇: Eu (97 % at 450 K) endowed by higher structural integrity and stability of pyrochlore phase.

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通过 B 位工程调整 Y2B2O7:Eu3+ 的结构和对称性，以获得高效且热稳定的荧光粉：Y2Zr2O7 与 Y2Ge2O7 的对比

目前迫切需要合成具有高光致发光量子产率（PLQY）和良好热稳定性的红色发光荧光粉，以制造高性能的荧光粉转换发光二极管（pc-LED），以减少碳排放。在这里，我们通过改变对称性和结构改性策略实现了这一目标，从而获得了高光量子产率和更好的热稳定性。在这项工作中，我们合成了高度对称的立方萤石 Y2Zr2O7:Eu3+，并通过有机无溶剂固态反应，用 Ge4+ 取代 B 位 Zr4+，以降低对称性并诱导结构变化为四方 Y2Ge2O7:Eu3+。在这三种成分中，Y2Ge2O7:Eu 由于降低了四方相的对称性，因此表现出更高的发射强度、更高的不对称率和更高的 PLQY（32.3%）。另一方面，Y2Zr2O7: Eu 具有更高的热稳定性（450 K 时为 97%），因为它具有更高的结构完整性和热核相稳定性。

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来源期刊

Materials Research Bulletin 工程技术-材料科学：综合

CiteScore

9.80

自引率

5.60%

发文量

372

审稿时长

42 days

期刊介绍： Materials Research Bulletin is an international journal reporting high-impact research on processing-structure-property relationships in functional materials and nanomaterials with interesting electronic, magnetic, optical, thermal, mechanical or catalytic properties. Papers purely on thermodynamics or theoretical calculations (e.g., density functional theory) do not fall within the scope of the journal unless they also demonstrate a clear link to physical properties. Topics covered include functional materials (e.g., dielectrics, pyroelectrics, piezoelectrics, ferroelectrics, relaxors, thermoelectrics, etc.); electrochemistry and solid-state ionics (e.g., photovoltaics, batteries, sensors, and fuel cells); nanomaterials, graphene, and nanocomposites; luminescence and photocatalysis; crystal-structure and defect-structure analysis; novel electronics; non-crystalline solids; flexible electronics; protein-material interactions; and polymeric ion-exchange membranes.