Glass network engineering of yellow-emitting Ba <sub>2</sub> Sc <sub>2</sub> B <sub>4</sub> O <sub>11</sub> :Ce <sup>3+</sup> glass ceramics for full-spectrum lighting
Shuang-Yin Zhu, Shilin Jin, Zhan Li, Qin Xu, Ziyi Hu, Jinfeng Qiu, Jiamin Chen, Tao Pang, Lingwei Zeng, Xinyue Li, Daqin Chen
Abstract
Currently, a full-spectrum illumination scheme based on violet-light-excitation is proposed to meet the pursuit of high-quality and healthy lighting. Unfortunately, the most important yellow phosphors are extremely scarce owing to low absorption efficiency of violet light and low photoluminescence quantum yield (PLQY). Herein, glass network engineering of the B<sub>2</sub>O<sub>3</sub>-BaO-Sc<sub>2</sub>O<sub>3</sub> system is developed to fabricate violet-light-excitable yellow-emitting Ba<sub>2</sub>Sc<sub>2</sub>B<sub>4</sub>O<sub>11</sub>(BSB):Ce<sup>3+</sup> glass ceramic (GC) with a record PLQY of 95.0% and superior stability. It is evidenced that optimized [BO<sub>3</sub>]/[BO<sub>4</sub>] ratio modifies the glass network structure, creating favorable sites for heterogeneous nucleation during <em>in situ</em> glass crystallization. It promotes the formation of well-crystallized BSB nanocrystals (NCs) within glass matrix, consequently improving the optical performance of the BSB:Ce<sup>3+</sup> 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 index (CRI) exceeding 93, ensuring superior overall color reproduction quality. This exploration in violet-light-excitable GC composite is poised to accelerate the development of ideal sun-like lighting technology.