**Influence of Alkali Metal Ions on Luminescence Behaviour of Ca0.5R1-***x***(MoO4)2:***x***Ln3+ (R = Y, La), (Ln = Eu, Tb, Dy) Pulsed Laser Deposited Thin Phosphor Films Influence of Alkali Metal Ions on Luminescence Behaviour of Ca0.5R1-***x***(MoO4)2:***x***Ln3+ (R = Y, La), (Ln = Eu, Tb, Dy) Pulsed Laser Deposited Thin Phosphor Films**

Jagannathan Thirumalai, Venkatakrishnan Mahalingam and Rajagopalan Krishnan Jagannathan Thirumalai, Venkatakrishnan Mahalingam and Rajagopalan Krishnan

Additional information is available at the end of the chapter Additional information is available at the end of the chapter

http://dx.doi.org/10.5772/65006

### **Abstract**

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2016.02.159

Thin phosphor films of Ca0.5R1-*x*(MoO4)2:*x*Ln3+, M+ (R3+ = La, Y), (Ln3+ = Eu, Tb, Dy) (M+  =  Li+ , K+ and Na+ ) were deposited on quartz substrates by pulsed laser deposition (PLD) technique by ablation of a stoichiometric monocrystal target. The deposition was carried out using an Nd-YAG laser (λ = 1064 nm) in an ultra-high vacuum (UHV) with an oxygen back pressure of 300 mTorr at 600°C substrate temperatures. The laser-ablated films are optically active, as verified by the photoluminescence (PL) spectra, and the films exhibit smooth Stark levels. The photoluminescence of the Ca0.5R1-*x*(MoO4)2:*x*Ln3+, M+ phosphors properties reveals characteristic visible emissions. Further, the co-doping of alkali metal chlorides MCl (M = Na, K, Li) into the Ca0.5R1-*x*(MoO4)2:*x*Ln3+, M+ phosphor greatly improves the luminescence intensity, which can be explained by charge compensation effect. The fluorescence lifetime and photometric coordinates are discussed in detail.

**Keywords:** rare-earth and alkaline activated, thin phosphor films, pulsed laser deposition, surface morphology, luminescence
