Band tailing: the random distribution of a large number of donors in the crystal also introduces a random variation in the potential energy, which causes the band tailing.

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In spite of all stories of prosperity in the Unites States, not only does poverty exist there, but crimes of various types have been increasing at an alarming rate. Most acts of violence were committed by young people. 57% of the riminals arrested in 1979 were youths below 25 of age.

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The author intends to tell the readers that______.

A．the United States is a wealthy country although poverty and crime exist there

B．crime has become a serious problem in the United States, although it is said to be a prosperous one

C．despite the fact that crimes have been increasing rapidly in the United States, it is a country of prosperity

D．in spite of stories about poverty and crime in the United States, it is prospering at an increasing rate

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B．crime has become a serious problem in the United States, although it is said to be a prosperous one

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D．in spite of stories about poverty and crime in the United States, it is prospering at an increasing rate

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Compared to photoluminescence from dilute solution of a pure organic material, the photoluminescence from the solid state of this pure material decreases dramatically with very large redshift. This is due to exciplex formation.

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