Color-tunable blue-emitting Na2MgSiO4:Ce3+ phosphors for white light-emitting diodes. Issue 3 (1st February 2023)

• Record Type: Journal Article
• Authors: Chen, Mengfang; Liao, Shuzhen; Han, Yue; Lian, Shixun; Zhang, Jilin
• Is Part Of: Ceramics international. Volume 49:Issue 3(2023)
• Page Start: 5431
• Page End: 5436
• Publication Date: 2023-02-01
• Subjects: Phosphor -- A. Powders: solid state reaction -- C. Optical properties -- D. Silicate; pc-wLEDs phosphor-converted white light-emitting diodes -- CRI color rendering index -- NMSO:xCe3+ Na2-xMg1-2xLi2xSiO4:xCe3+ -- XRD X-ray powder diffraction -- GSAS general structure analysis system -- PLE excitation -- PL emission -- EL electroluminescence -- CIE International Commission on Illumination; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2022.10.066
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: Phosphor-converted white light-emitting diodes (pc-wLEDs) based on near-UV LED chip demand efficient blue-emitting phosphors, because the pc-wLED uses either multi phosphors or single-phase white-emitting phosphor both needs blue-emitting component. When using Ce 3+ as the activator, the host structure usually has rare earth ions or alkaline earth ion such as Ca 2+ for Ce 3+ to occupy, due to similar ionic radius and charge. This work is going to report a blue-emitting phosphor Na2 MgSiO4 :Ce 3+, where Ce 3+ occupies the Na + sites. The phosphor exhibits characteristic of tunable emission color upon increasing Ce 3+ content or introducing Li + as charge compensator. The relationship between the crystal structure and the luminescent properties was studied in detail based on structural refinement and in-depth luminescent studies. The phosphor with a proper Ce 3+ content showed a high absolute quantum efficiency of 86.0% and acceptable thermal stability. The pc-wLED made of 365 nm UV chip, the as-prepared Na2 MgSiO4 :Ce 3+, Li +, and commercial green and red phosphors showed good performance with color rendering index of 93.3.