Fabrication of CaS:Pb blue phosphor by incorporating dimeric Pb[sup 2+] luminescent centers

Yun, Sun Jin; Kim, Yong Shin; Park, Sang-Hee Ko
February 2001
Applied Physics Letters;2/5/2001, Vol. 78 Issue 6, p721
Academic Journal
The CaS:Pb phosphor emitting blue electroluminescence (EL) induced by dimeric Pb[sup 2+] luminescent centers was deposited using the controlled atomic layer deposition technique. The effect of the incorporation method and concentration of Pb[sup 2+] ions on the color of high luminance CaS:Pb phosphor was investigated at the deposition temperatures of 350 and 400 °C. The blue EL emission at 440-445 nm could be maintained with the Pb concentration ranging from 0.6 to 2.5 mol % contrary to the earlier works that had demonstrated very sensitive dependence of color on Pb[sup 2+] concentration. The selective incorporation of dimeric Pb[sup 2+] ions was attributed to the reactivity of tetraethyl lead as Pb precursor as well as the controlled deposition technique. © 2001 American Institute of Physics.


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