Precautions decorative rocks
2014-08-19 by bridgeyanju
When SrAl2O4 365nm UV excitation light when , Eu2 + 4f → 5d
transitions produce . Auxiliary active ions Dy3 + and adding , changing
the shape of the lattice , the lattice distortion , resulting in the
impurity level ( trap level ) ,
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level is mainly produced by the D to join , and replaced by Sr2 + Dy3 +
cause the generation of holes , the trap level is relatively uniform
holes produced by the donor level . The energy level in the excited
state of Eu2 + ground state level and between levels . When an electron
is excited from the ground state to the excited state ,
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of the electronic transition back to the low level produces light,
another part of the electrons through the relaxation process is stored
in the trap energy level , when the electron trap levels absorbed
energy, the re- stimulated Back excited states , transitions back to the
ground state energy and light.