Structural and emission properties of Eu3+ -doped alkaline earth zinc-phosphate glasses for white LED applications

2017 ◽  
Vol 100 (4) ◽  
pp. 1402-1411 ◽  
Author(s):  
Kaushal Jha ◽  
Mula Jayasimhadri
Keyword(s):  
Alkaline Earth ◽  
Zinc Phosphate ◽  
Phosphate Glasses ◽  
White Led ◽  
Emission Properties

Theoretical Studies of the Spin Hamiltonian Parameters and Local Distortions for Cu2+ in Alkaline Earth Lead Zinc Phosphate Glasses

2016 ◽  
Vol 71 (8) ◽  
pp. 769-775 ◽  
Author(s):  
Bo-Kun Wang ◽  
Shao-Yi Wu ◽  
Zi-Yi Yuan ◽  
Zi-Xuan Liu ◽  
Shi-Xin Jiang ◽  
...  
Keyword(s):  
Field Strength ◽  
Crystal Field ◽  
Alkaline Earth ◽  
Zinc Phosphate ◽  
Phosphate Glasses ◽  
Spin Hamiltonian ◽  
Local Structures ◽  
Crystal Field Strength ◽  
Lead Zinc ◽  
Hamiltonian Parameters

AbstractThe spin Hamiltonian parameters and local structures are theoretically studied for Cu2+-doped alkaline earth lead zinc phosphate (RPPZ, R=Mg, Ca, Sr, and Ba) glasses based on the high-order perturbation calculations for a tetragonally elongated octahedral 3d9 cluster. The relative elongation ratios are found to be ρ≈3.2%, 4.4%, 4.6%, and 3.3% for R=Mg, Ca, Sr, and Ba, respectively, because of the Jahn-Teller effect. The whole decreasing crystal-field strength Dq and orbital reduction factor k from Mg to Sr are ascribed to the weakening electrostatic coulombic interactions and the increasing probability of productivity of nonbridge oxygen (and hence increasing Cu2+–O2− electron cloud admixtures) under PbO addition, respectively, with increasing alkali earth ionic radius. The anomalies (the largest Dq and the next highest k among the systems) for R=Ba are attributed to the cross linkage of this large cation in the network. The overall increasing order (Mg≤Ba<Ca<Sr) of ρ is largely due to the decreasing crystal-field strength Dq and hence the decreasing force constant of the Cu2+–O2− bonds. The present studies would be helpful to understand local structures and the influences on the optical properties of RPPZ glasses containing copper dopants.

Calcium-zinc phosphate glasses activated with Tb3+/Eu3+ for laser and white LED applications

2019 ◽  
Vol 215 ◽  
pp. 116621 ◽  
Author(s):  
A.U. Trápala-Ramírez ◽  
J.L.N. Gálvez-Sandoval ◽  
A. Lira ◽  
I. Camarillo ◽  
E. Alvarez-Ramos ◽  
...  
Keyword(s):  
Zinc Phosphate ◽  
Phosphate Glasses ◽  
White Led

Exploration of zinc phosphate glasses dispersed with Eu-doped SiAlON for white LED applications

2013 ◽  
Vol 35 (12) ◽  
pp. 2677-2684 ◽  
Author(s):  
Hiroyo Segawa ◽  
Naoto Hirosaki ◽  
Shinobu Ohki ◽  
Kenzo Deguchi ◽  
Tadashi Shimizu
Keyword(s):  
Zinc Phosphate ◽  
Phosphate Glasses ◽  
White Led
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