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Detailed Program
Paper Number : LD-P04
Time Frame : 12:00~13:30
Presentation Date : Thursday, 27, November
Session Name : LED and Display Materials
Session Chair 1# : -
Session Chair 2# : -
Effect of B-doping on Persistent Luminescence in (Sr,Ca)Al2O4: Eu2+,Dy3
Jeong Seog Kim
Hoseo University
Keywords: oxide phosphors, B-doping, persistent, life-time, decay, phase analysis

Persistent phosphors have much longer decay-life time than a second. Some persistent phosphors show the decay time over several hours after dosing excitation energy such as UV- and VIS-light. Hence long persistent phosphor materials can have various applications such as night-vision surveillance, safety signage, energy harvesting, and optical data storage. However, bottle neck in this field is how to increase the luminescence intensity during the decaying time and to fine-tune the excitation energy to visible light range. In this study we investigated the effect of B-addition in (Sr,Ca)Al2O4: Eu2+,Dy3 on the luminescence intensity and the decay-life. We analyzed phase formation by the addition of B of the phosphors.
References:
[1] Matsuzawa, T.; Aoki, Y.; Takeuchi, N.; Murayama, Y. A new long phosphorescent phosphor with high brightness, SrAl2O4:Eu2+,Dy3+. J. Electrochem. Soc., 143(1996) 2670–2673
[2] Clabau, F.; Rocquefelte, X.; Le Mercier, T.; Deniard, P.; Jobic, S.; Whangbo, M.H. Formulation of phosphorescence mechanisms in inorganic solids based on a new model of defect conglomeration. Chem. Mater. 18(2006) 3212–3220.
Acknowledgements :