Spectral photoluminescence properties of YAG: Ce, R (R: Gd3+, Pr3+, Gd3+ and Pr3+) transparent fluorescent thin film prepared by pulse laser deposition

• Published in: Journal of luminescence 2020-07, Vol.223, p.117222, Article 117222
• Main Authors: Cao, Xing, Sun, Shichang, Lu, Bing, Liu, Yan, Ma, Rui, Cao, Huiqun, Ma, Hongzhi, Huang, Hexun
• Format: Article
• Language: English
• Subjects: Photoluminescence properties; Pulse laser deposition; Transparent thin film; Tri-doped YAG; YAG:Ce
• ISSN: 0022-2313; 1872-7883
• DOI: 10.1016/j.jlumin.2020.117222

In order to overcome the shortcomings of insufficient red light component and poor thermal stability of commercial white light emitting diode (WLED), YAG:Ce, R (R: Gd3+, Pr3+, Gd3+ and Pr3+) fluorescent thin films were prepared by pulse laser deposition (PLD). The composition and microstructure, photoluminescence properties, and red-enhanced mechanism of co-doped YAG fluorescent thin films, as well as the electroluminescence behavior of the corresponding WLEDs were investigated. Results showed that the doping of Pr3+ caused the emission spectrum energy of Ce3+ to migrate, and an emission peak appeared at 606 nm in the red region. The doping of Gd3+ caused the emission spectrum of Ce3+ to shift to the red region, and the main peak position of the Ce3+ emission spectrum is red-shifted from 523 nm to 548 nm. The YAG:Ce,Pr,Gd fluorescent film not only realized the improvement of red light components and red-shift, but also increased the energy transmission efficiency from 33.3% to 51.9%. Moreover, results of the color coordinate analysis also showed that the co-doping of Gd3+ and Pr3+ made the luminescence closer to the red region, reducing the color temperatures and hues changed to warm. Thus, tri-doped transparent fluorescent thin film were prospective for WLED application. •Tri-doped YAG:Ce,Pr,Gd fluorescent thin film was successfully prepared by PLD.•The YAG:Ce,Pr,Gd thin film realizes red shift and increases red-emission.•The co-doped Gd3+ can increase the energy transfer efficiency of Ce3+ to Pr3+.