Abstract

The emission spectra of a representative group of inorganic solid phosphors have been measured at temperatures as low as 4°K. Of the phosphors investigated, only those having “edge” emission show a tendency to exhibit a line spectrum at low temperatures; the ordinary impurity activated materials show little or no change in emission below 100°K. It is improbable that the breadth of emission is due to the interaction of the luminescent center with impurities or lattice defects since neither cold work nor variation in concentrations of impurities affects the breadth of emission. Possible explanations of the broad band, low temperature emission are the existence of a zero-point vibrational energy of a nonphotoconducting luminescent center in its excited state; and, in the case of photoconducting phosphors, the distortion of exciton and conduction levels near the luminescent center.

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  1. J. T. Randall, Nature 142, 113 (1938). J. T. Randall, Proc. Roy. Soc. (London) 170, 272 (1939). J. T. Randall, Trans. Faraday Soc. 35, 2 (1939).
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  8. R. Frerichs, Naturwiss. 33, 281 (1946).
  9. M. E. Wise and H. A. Klasens, J. Opt. Soc. Am. 38, 226 (1948).
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  11. C. C. Klick, Phys, Rev, 79, 894 (1950).
  12. E. Nagy, J. Opt. Soc. Am. 39, 42 (1949).
  13. Schulman, Ginther, and Claffy, J. Electrochem. Soc. 96, 57 (1949).
  14. E. Burstein and J. J. Oberly, Phys. Rev. 78, 349 (1950).
  15. G. H. Wannier, Phys. Rev. 76, 438 (1949).
  16. A. von Hippel, Z. Physik 101, 680 (1936).
  17. F. Seitz, Trans. Faraday Soc. 35, 79 (1939).
  18. M. Schön, Ann. d. Physik, Series 6, 3, 343 (1948).
  19. G. Szigeti and E. Nagy, Pubs. of the Univ. for Tech. Sciences, Budapest 1, 115 (1948).
  20. F. Seitz, Phys. Rev. 76, 1376 (1949).
  21. M. Mell, Z. Physik 16, 244 (1923).
  22. S. Rothschild, Trans. Faraday Soc. 42, 635 (1946).
  23. F. A. Kröger and J. E. Hellingman, J. Electrochem. Soc. 93, 156 (1948); 95, 68 (1949).
  24. F. E. Williams, Phys. Rev. 80, 306 (1950). F. E. Williams, J. Chem. Phys. 19, 457 (1951).
  25. F. E. Williams, Phys. Rev. 82, 281 (1951).

Burstein, E.

E. Burstein and J. J. Oberly, Phys. Rev. 78, 349 (1950).

Frerichs, R.

R. Frerichs, Naturwiss. 33, 281 (1946).

Gurney, R. W.

N. F. Mott and R. W. Gurney, Electronic Processes in Ionic Crystals (Oxford University Press, London, 1940), p. 116.

Hellingman, J. E.

F. A. Kröger and J. E. Hellingman, J. Electrochem. Soc. 93, 156 (1948); 95, 68 (1949).

Klasens, H. A.

M. E. Wise and H. A. Klasens, J. Opt. Soc. Am. 38, 226 (1948).

Klick, C. C.

C. C. Klick and J. H. Schulman, Phys. Rev. 75, 1606 (1949).

C. C. Klick, Phys, Rev, 79, 894 (1950).

C. C. Klick and J. H. Schulman, J. Opt. Soc. Am. 40, 509 (1950).

Kröger, F. A.

F. A. Kröger and J. E. Hellingman, J. Electrochem. Soc. 93, 156 (1948); 95, 68 (1949).

F. A. Kröger, Physica 7, 1 (1940).

Mell, M.

M. Mell, Z. Physik 16, 244 (1923).

Mott, N. F.

N. F. Mott and R. W. Gurney, Electronic Processes in Ionic Crystals (Oxford University Press, London, 1940), p. 116.

Nagy, E.

E. Nagy, J. Opt. Soc. Am. 39, 42 (1949).

G. Szigeti and E. Nagy, Pubs. of the Univ. for Tech. Sciences, Budapest 1, 115 (1948).

Oberly, J. J.

E. Burstein and J. J. Oberly, Phys. Rev. 78, 349 (1950).

Peierls, R.

R. Peierls, Ann. Physik 13, 905 (1932).

Radkowsky, A.

A. Radkowsky, Phys. Rev. 73, 749 (1948).

Randall, J. T.

J. T. Randall, Nature 142, 113 (1938). J. T. Randall, Proc. Roy. Soc. (London) 170, 272 (1939). J. T. Randall, Trans. Faraday Soc. 35, 2 (1939).

Rothschild, S.

S. Rothschild, Trans. Faraday Soc. 42, 635 (1946).

Schön, M.

M. Schön, Ann. d. Physik, Series 6, 3, 343 (1948).

Schulman, J. H.

C. C. Klick and J. H. Schulman, J. Opt. Soc. Am. 40, 509 (1950).

C. C. Klick and J. H. Schulman, Phys. Rev. 75, 1606 (1949).

Seitz, F.

F. Seitz, Phys. Rev. 76, 1376 (1949).

F. Seitz, Trans. Faraday Soc. 35, 79 (1939).

Szigeti, G.

G. Szigeti and E. Nagy, Pubs. of the Univ. for Tech. Sciences, Budapest 1, 115 (1948).

Urbach, F.

F. Urbach, Sitzber. Akad. Wiss. Wien, Math.-naturw Klasse, Abt. Ha 138, 389 (1929); 139, 349 (1930).

von Hippel, A.

A. von Hippel, Z. Physik 101, 680 (1936).

Wannier, G. H.

G. H. Wannier, Phys. Rev. 76, 438 (1949).

Williams, F. E.

F. E. Williams, Phys. Rev. 80, 306 (1950). F. E. Williams, J. Chem. Phys. 19, 457 (1951).

F. E. Williams, Phys. Rev. 82, 281 (1951).

Wise, M. E.

M. E. Wise and H. A. Klasens, J. Opt. Soc. Am. 38, 226 (1948).

Other (25)

J. T. Randall, Nature 142, 113 (1938). J. T. Randall, Proc. Roy. Soc. (London) 170, 272 (1939). J. T. Randall, Trans. Faraday Soc. 35, 2 (1939).

R. Peierls, Ann. Physik 13, 905 (1932).

F. Urbach, Sitzber. Akad. Wiss. Wien, Math.-naturw Klasse, Abt. Ha 138, 389 (1929); 139, 349 (1930).

N. F. Mott and R. W. Gurney, Electronic Processes in Ionic Crystals (Oxford University Press, London, 1940), p. 116.

A. Radkowsky, Phys. Rev. 73, 749 (1948).

C. C. Klick and J. H. Schulman, J. Opt. Soc. Am. 40, 509 (1950).

F. A. Kröger, Physica 7, 1 (1940).

R. Frerichs, Naturwiss. 33, 281 (1946).

M. E. Wise and H. A. Klasens, J. Opt. Soc. Am. 38, 226 (1948).

C. C. Klick and J. H. Schulman, Phys. Rev. 75, 1606 (1949).

C. C. Klick, Phys, Rev, 79, 894 (1950).

E. Nagy, J. Opt. Soc. Am. 39, 42 (1949).

Schulman, Ginther, and Claffy, J. Electrochem. Soc. 96, 57 (1949).

E. Burstein and J. J. Oberly, Phys. Rev. 78, 349 (1950).

G. H. Wannier, Phys. Rev. 76, 438 (1949).

A. von Hippel, Z. Physik 101, 680 (1936).

F. Seitz, Trans. Faraday Soc. 35, 79 (1939).

M. Schön, Ann. d. Physik, Series 6, 3, 343 (1948).

G. Szigeti and E. Nagy, Pubs. of the Univ. for Tech. Sciences, Budapest 1, 115 (1948).

F. Seitz, Phys. Rev. 76, 1376 (1949).

M. Mell, Z. Physik 16, 244 (1923).

S. Rothschild, Trans. Faraday Soc. 42, 635 (1946).

F. A. Kröger and J. E. Hellingman, J. Electrochem. Soc. 93, 156 (1948); 95, 68 (1949).

F. E. Williams, Phys. Rev. 80, 306 (1950). F. E. Williams, J. Chem. Phys. 19, 457 (1951).

F. E. Williams, Phys. Rev. 82, 281 (1951).

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