A series of Eu²⁺-doped orthosilicate-orthophosphate solid-solution phosphors, K_xBa_1.97–x(Si_1–xP_x)O₄:0.03Eu²⁺, have been synthesized via the conventional solid-state reaction. Using varying compositions, the lowest-energy excitation can be tuned from 470 to 405 nm, with an emission from 515 to 423 nm. We determined how chainlike cation polyhedra controlled excitation- and emission-band features by introducing in-chain characteristic length d₂₂ and outside-chain characteristic length d₁₂ and that there was a nearly linear relationship between the lowest-energy-excitation position and the ratio of d₂₂ to d₁₂. This influence of chainlike polyhedra on luminescence can be understood through the inductive effect. Luminescent thermal properties are improved remarkably by the cosubstitution of K⁺ and P⁵⁺ ions for Ba²⁺ and Si⁴⁺ ions with a T_1/2 over 200 °C. We have established the host-referred-binding-energy (HRBE) and vacuum-referred-binding-energy (VRBE) schemes for the electronic structure of the series of lanthanide-doped phosphors according to the Dorenbos model and given a thermal-quenching mechanism for this series of phosphors.

中文翻译：

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链状多面体和电子结构控制Eu ²⁺掺杂的正硅酸盐-正磷酸盐荧光粉的发光

通过常规固相反应合成了一系列Eu ²⁺掺杂的原硅酸盐-正磷酸盐固溶体荧光粉K _x Ba _{1.97– x}（Si _{1– x} P _x）O ₄：0.03Eu ²⁺。使用不同的成分，最低能量激发可以从470 nm调整到405 nm，发射光从515 nm吸收到423 nm。通过引入链内特征长度d ₂₂和链外特征长度d _12，我们确定了链状阳离子多面体如何控制激发带和发射带的特征最低能量激发位置与d ₂₂与d ₁₂之比几乎呈线性关系。链状多面体对发光的这种影响可以通过感应效应来理解。通过将K ⁺和P ⁵⁺离子与Ba _1/2 ⁺和Si ⁴⁺离子共置换为T _1/2可以显着改善发光热性能超过200°C。根据Dorenbos模型，我们为镧系掺杂荧光粉系列的电子结构建立了主机参考结合能（HRBE）和真空参考结合能（VRBE）方案，并给出了热猝灭机理。用于这一系列的荧光粉。