PDF(Pubmed)
Abstract：
Aluminum garnets display exceptional adaptability in incorporating mismatching elements, thereby facilitating the synthesis of novel materials with tailored properties. This study explored Ce3+-doped Tb3Al5-xScxO12 crystals (where x ranges from 0.5 to 3.0), revealing a novel approach to control luminescence and photoconversion through atomic size mismatch engineering. Raman spectroscopy confirmed the coexistence of garnet and perovskite phases, with Sc substitution significantly influencing the garnet lattice and induced A1g mode softening up to Sc concentration x = 2.0. The Sc atoms controlled sub-eutectic inclusion formation, creating efficient light scattering centers and unveiling a compositional threshold for octahedral site saturation. This modulation enabled the control of energy transfer dynamics between Ce3+ and Tb3+ ions, enhancing luminescence and mitigating quenching. The Sc admixing process regulated luminous efficacy (LE), color rendering index (CRI), and correlated color temperature (CCT), with adjustments in CRI from 68 to 84 and CCT from 3545 K to 12,958 K. The Ce3+-doped Tb3Al5-xScxO12 crystal (where x = 2.0) achieved the highest LE of 114.6 lm/W and emitted light at a CCT of 4942 K, similar to daylight white. This approach enables the design and development of functional materials with tailored optical properties applicable to lighting technology, persistent phosphors, scintillators, and storage phosphors.
摘要：
铝石榴石在掺入不匹配元素方面表现出卓越的适应性，从而促进具有定制性能的新型材料的合成。这项研究探索了Ce3掺杂的Tb3Al5-xScxO12晶体（其中x范围从0.5到3.0），揭示了一种通过原子尺寸失配工程控制发光和光转换的新方法。拉曼光谱证实了石榴石和钙钛矿相的共存，Sc取代显着影响石榴石晶格，并诱导A1g模式软化至Sc浓度x=2.0。Sc原子控制亚共晶夹杂物的形成，创建有效的光散射中心，并揭示八面体位置饱和的成分阈值。这种调制能够控制Ce3+和Tb3+离子之间的能量转移动力学，增强发光和减轻猝灭。Sc混合过程调节发光效率(LE)，显色指数(CRI)，和相关色温(CCT)，CRI从68调整到84，CCT从3545K调整到12,958K。掺杂Ce3+的Tb3Al5-xScxO12晶体（其中x=2.0）达到了114.6lm/W的最高LE，并以4942K的CCT发射光，类似于白日。这种方法可以设计和开发具有适用于照明技术的定制光学特性的功能材料，持久性磷光体，闪烁体,和储存磷光体。
