Abstract A high intrinsic quantum yield and color purity red-emitting nanostructured Eu3+-doped 1-xSiO2-xNb2O5 materials were prepared by a new sol-gel route at different Si:Nb molar ratio for solid-state lighting and energy conversion. It was evaluated how the composition and annealing temperature can affect the structure of the materials and their luminescence features. Eu3+ ions distribution into the different symmetry sites of nanoscaled orthorhombic or monoclinic Nb2O5 particles considerately influenced their emission profile and efficiency. A UV and blue to red downshifting were detected, and by using Judd-Ofelt theory, high quantum intrinsic quantum yield up to 65% is calculated for the Eu3+ doped Nb2O5 nanoparticles upon excitation at 463 nm. Additionally, the chromaticity diagram figured out a red color purity up to 90.1% is obtained, making them promising material for solid-state lighting. The particle size and doping control make them possible to explore the solid-state property of nanoscaled Nb2O5 particles as a host, with the advantage of their homogenous dispersion in a silicate network, opening the possibility of their use as planar waveguides for solar cell concentrators and energy conversion for enhancement of solar cell efficiency.

中文翻译：

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用于固态照明和能量转换的硅酸盐基质中的高红色发光 Nb2O5:Eu3+ 纳米粒子

摘要 通过不同Si:Nb 摩尔比的溶胶-凝胶路线制备了一种高本征量子产率和色纯度的红色发光纳米结构Eu3+ 掺杂1-xSiO2-xNb2O5 材料，用于固态照明和能量转换。评估了成分和退火温度如何影响材料的结构及其发光特性。Eu3+ 离子分布到纳米级正交或单斜 Nb2O5 粒子的不同对称位点，对它们的发射剖面和效率产生了很大的影响。检测到 UV 和蓝色到红色的下移，并且通过使用 Judd-Ofelt 理论，计算出 Eu3+ 掺杂的 Nb2O5 纳米粒子在 463 nm 激发时的高量子本征量子产率高达 65%。此外，色度图计算出红色纯度高达 90.1%，使它们成为有前途的固态照明材料。粒径和掺杂控制使他们能够探索纳米级 Nb2O5 粒子作为主体的固态特性，其优势在于它们在硅酸盐网络中的均匀分散，开启了它们用作太阳能电池聚光器的平面波导和用于提高太阳能电池效率的能量转换。