In recent times, non-Eu²⁺ based persistent phosphor materials show promise for self-sustained night vision surveillance and bio-imaging owing to their ability to luminesce overnight, high chemical stability, and broad-band absorption. While green and yellow wavelengths are widely explored, the research and development of persistent phosphors in the blue region are still lacking, owing to the limited understanding of the luminescence persistence mechanism. Herein, it is to be reported a new blue-emitting Na₃ScSi₃O₉:Ce³⁺, Dy³⁺ phosphor, which exhibits a strong emission at 450 nm that persists for nearly 17 h above the recognizable intensity level (0.32 mcd/m²), which is the longest persistent phosphor in the blue region. Thermoluminescence experiments reveal a fifth-order-of-magnitude rise in the trap density by Dy³⁺ incorporation into Na₃ScSi₃O₉:Ce³⁺, which is responsible for the long persistence of the emission. Furthermore, by employing Mn²⁺, Tb³⁺, and Dy³⁺ as co-activators, it is realized that the trap density is proportional to the persistence time. Finally, an underlying mechanism for this blue emission persistence is proposed. These results might push forward the design of new blue-emitting phosphors with higher persistent luminescence efficiencies.

近年来，基于非Eu ²⁺的持久性磷光材料由于具有夜间发光，高化学稳定性和宽带吸收的能力，因此有望实现自我维持的夜视监视和生物成像。尽管绿色和黄色的波长已被广泛探索，但由于对发光持久性机理的了解有限，仍缺乏在蓝色区域中持久性磷光体的研究和开发。在此，据报道有一种新型的发蓝光的Na ₃ ScSi ₃ O ₉：Ce ³⁺，Dy ³⁺荧光粉，在450 nm处显示出强发射，并在高于可识别强度水平（0.32 mcd /米²），它是蓝色区域中最长的持久性磷光体。热致发光实验表明，通过将Dy ³⁺掺入Na ₃ ScSi ₃ O ₉：Ce ^3+中，陷阱能级增加了五个数量级，这是导致发射持续时间长的原因。此外，通过使用Mn 2 ⁺，Tb ³⁺和Dy ³⁺作为助活化剂，可以实现陷阱密度与持续时间成正比。最后，提出了这种蓝色发射持久性的潜在机制。这些结果可能会推动具有更高持续发光效率的新型蓝色荧光粉的设计。