Abstract
Pr 3+, Yb 3+ co-doped Y 2O 3 transparent ceramics have been prepared by the solid state reaction and vacuum sintering. Down-conversion near infrared emission has been demonstrated upon a 482 nm excitation. The energy of the 482 nm blue photon was first absorbed by Pr 3+ and then delivered to Yb 3+. Possible energy transfer mechanisms from Pr 3+ to Yb 3+ have been discussed. Under the 482 nm excitation, the Pr 4+–Yb 2+ charge transfer state would not seriously influence the energy transfer process. The dominant one should be either the cooperative down-conversion or the two-step photon emission. The efficient down-conversion near infrared emission has potential application in enhancing the conversion efficiency of crystalline silicon solar cells.
Published Version
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