Currently, a full-spectrum illumination scheme based on violet-light excitation is proposed to achieve high-quality and healthy lighting. Unfortunately, the most important yellow phosphors are extremely scarce owing to the low absorption efficiency of violet light and low photoluminescence quantum yield (PLQY). In this study, glass network engineering of the B₂O₃–BaO–Sc₂O₃ system was developed to fabricate violet-light-excitable yellow-emitting Ba₂Sc₂B₄O₁₁ (BSB):Ce³⁺ glass ceramic (GC) with a record PLQY of 95.0% and superior stability. The optimized [BO₃]/[BO₄] ratio modifies the glass network structure, creating favorable sites for heterogeneous nucleation during in situ glass crystallization. This promoted the formation of well-crystallized BSB nanocrystals (NCs) within the glass matrix, consequently improving the optical performance of the BSB:Ce³⁺ GC composite. This enables the construction of both light-emitting diode (LED)- and laser diode (LD)-driven full-spectrum light sources with high color rendering indices (CRIs) exceeding 93, ensuring superior overall color reproduction quality. This exploration of violet-light-excitable GC composites is intended to accelerate the development of ideal sun-like lighting technology.

Dual-phases glass ceramics (GCs) containing LiYF₄: Ln³⁺(Ln=Eu, Tb, Dy) and ZnAl₂O₄: Cr³⁺ nanocrystals (NCs) were fabricated by a conventional melt-quenching method. The structural and spectrographic characterizations indicate that Ln³⁺ can be doped into LiYF₄ lattice and Cr³⁺ can be introduced into ZnAl₂O₄ lattice, respectively. In this regard, the luminescent centers are physically separated through a spatial isolation strategy, getting rid of adverse energy transfer processes. The dual-modal luminescence of Ln³⁺ and Cr³⁺ can be thus attained simultaneously. Also, optical thermometry based on the fluorescence intensity ratio (FIR) of Ln³⁺/Cr³⁺ is performed. Under irradiation upon 377 nm, the FIR value for Tb³⁺: ⁵D₄→⁷F₅ and Cr³⁺: ²E→⁴A₂ transitions varies acutely, with a maximal relative sensitivity of 0.80%·K^–1 at 570 K. The FIR-based optical thermometry for Dy³⁺: ⁴F_9/2→⁶H_13/2 and Cr³⁺: ²E→⁴A₂ transitions is carried out, with a maximal relative sensitivity of 0.86%·K^–1 at 573 K. As a consequence, the dual-phases GCs can be an ideal medium for the spatial isolation of luminescent centers, suppressing an adverse energy transfer process and realizing an efficient dual-mode luminescence. This is beneficial to the application of FIR-based optical thermometry for GC materials.