Sentence examples for host crystals from inspiring English sources

That the luminescent properties of phosphor centres are strongly dependent on the chemical nature of the host crystal may be seen in the Table, showing that the same activator ions (manganese ions with two positive charges, indicated as Mn2+, or Mn[II]), in different host crystals yield remarkably different-coloured emissions and decay times (measured in fractions of a second).

The electronic energy levels of crystals such as zinc sulfide and other host crystals used in phosphors form bands: in the ground state practically all electrons are to be found on the valence band, whereas they reach the conduction band after sufficient excitation.

Also, the impurities could be a part of luminescent centers by forming complexes with host crystals.

Both results involve sensitized luminescence using diode-pumped Tm3+ ions in host crystals with reduced multi-phonon relaxation rates.

The mid-infrared range (3 to 10 μm) is not directly accessible using host crystals that have tightly bound oxygen or fluorine ions.

Energy transfer from Tm3+ to Ho3+ has been used to create diode-pumped 2.1-μm lasers using YLF [7] and YAG [8] host crystals.

In describing a luminescent phosphor, the following information is pertinent: crystal class and chemical composition of the host crystal, activator (type and percentage), coactivator (intensifier activator), temperature and time of crystallization process, emission spectrum (or at least visual colour), and persistence.

Titania is called an intensifier activator because it increases the host-crystal luminescence, whereas a substance that produces luminescence not exhibited by the chemically pure host crystal is called an originative activator.

If the host crystal is a metal, the magnetic impurities make an interesting contribution to the electrical resistivity.

These centres must not be too close together within the host crystal lest they inactivate each other.

The relative levels of the zinc sulfide valence band (ground state of the host-crystal lattice) and the conduction band (excited state of the host-crystal lattice), of activator levels and of trap levels are shown in Figure 2. Points 1, 2, 3, and 4 represent one situation in a host crystal, and points 5, 6, 7, 8, 9, and 10 represent another situation.