Enhancing Infrared Photoluminescence Performance via Li+ Substitution and Yb3+ Codoping in Na3ScSi3O9:Cr3+ Phosphor

Cr3+-doped broadband infrared luminescent materials have attracted growing attention in consideration of their potential applications phosphor-converted light sources. However, discovering infrared-emitting with ultrabroadband emission and excellent thermal stability still remains a challenge. In this work, we report the significant improvement photoluminescence properties Na3ScSi3O9:Cr3+ phosphor via Li+ substitution Yb3+ codoping. The prepared can produce broad over 650–1350 nm peak maximum at 898 under excitation blue light. Through for Na+, be tuned from to 850 nm. When content is 0.5, integrated luminescence intensity obtained Na2.5Li0.5ScSi3O9:Cr3+ increases by 4.2 times compared that phosphor, also improved significantly (58.5%@100 °C). Moreover, codoping simultaneously realize characteristic Cr3+ Yb3+, resulting broadened spectral width due efficient energy transfer Yb3+. Finally, an light-emitting diode prototype fabricated through combination optimized Na2.5Li0.5ScSi3O9:2%Cr3+,0.5%Yb3+ commercial 490 LED chip, giving output power 5.2 mW 320 mA drive current. This work provides effective way optimize performance Na3ScSi3O9 phosphors.