Disordered fluorite-type photochemical hole burning crystal cont

Details Disordered fluorite-type photochemical hole burning crystal cont Disordered fluorite-type photochemical hole burning crystal cont

1994-12-02

1995-12-26

Bonner, C. Melissa

Compositions

Inorganic luminescent compositions

Compositions containing halogen; e.g., halides and oxyhalides

423263, 423464, 501151, 501152, 501123, C01G 5700, C30B 900

Patent

active

054784980

ABSTRACT:
A disordered fluorite-type photochemical hole burning crystal contains Sm.sup.2+ as active ions, and a composition except Sm.sup.2+ is represented by a general formula .alpha.-(MALn)F.sub.6-v X.sub.v where 0.ltoreq.v.ltoreq.1, and M is an element selected from Ca, Sr and Ba, A is an element selected from Na, K, Rb and Cs, Ln is an element selected from Y, La, Gd and Ce, and X is an element selected from Cl, Br and I. Stable hole burning occurs at the room temperature to create narrow holes. The crystal can be used as a superior optical recording material for a room temperature operation.

REFERENCES:
R. Jaaniso et al, "Room Temperature Persistent Spectral Hole Burning in SM-Doped SrFCL.sub.1/2 Br.sub.1/2 Mixed Crystals", Europhysics Letters, 16 (6), pp. 569-574 (1991), Oct. 7, 1991.
C. Wei et al, "Two-Photon Hole Burning and Fluorescence-Line Narrowing Studies on BaFCL.sub.0.5 Br.sub.0.5 :Sm.sup.2+ at 77 K", Journal of Luminescence, 43 (1989) 161-166.
K. Hirao et al, "High Temperature Persistent Spectral Hole Burning of Sm.sup.2+ in Fluorohafnate Glasses", Journal of Non-Crystalline Solids, 152 (1993) 267-269.
K. Hirao et al, "Room-temperature Persistent Hole Burning of Sm.sup.2+ in Oxide Glasses", Optics Letters, vol. 18, No. 19, Oct. 1, 1993.

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