Mechanism and parameters of the quenching of luminescence of rare-earth ions by hydroxyl impurity groups in laser phosphate glass

Abstract

As an application of pulse intense electron beam for pollution control, removal of nitrogen oxides (NO x ) in atmospheric pressure N 2 was demonstrated. The pulse electron beam (energy; ∼200 keV, current; ∼140 A, current density; ∼2.2 A/cm 2 and pulse width; ∼500 ns) was injected into a gas cell filled by 1 atmospheric pressure N 2 with an initial concentration of 200 ppm of NO and at a temperature of 26 • C. The typical removal ratio was 17% for the first shot and reached to 93% after 8 successive shots. This removal ratio corresponds to 2740 nmol of removed NO x and to a 192 nmol/J removal efficiency. Many nitrogen radicals produced by the electron beam interaction with N 2 play an important role in the reduction of NO. The removal ratio was increased to 33% for the first shot when the initial concentration of NO was decreased to 64 ppm. However, the amount of removed NO x was smaller at low initial concentrations. When the filling pressure was decreased to 260 Torr, the amount of removed NO x decreased almost proportional to the pressure.

Concentration quenching in erbium-doped tellurite glasses

“…The value of C Er,Er in our modified tellurite glass is about 46 Â 10 À40 cm 6 s À1 . This value is much larger than that in sodalime silicate glass (23 Â 10 À40 cm 6 s À1 ) [17] and phosphate glass (7 Â 10 À40 cm 6 s À1 ) [18]. glass can be explained to some extent by the two facts.…”

Rare-earth doped polymers for planar optical amplifiers

“…The fact that both data sets can be described by the same slope indicates that the quencher concentration in 175 nm and 340 nm colloids is the same, which is expected, as the fabrication procedure for the two sizes is similar. Using a typical value for C Er-Er from the literature (10 Ϫ39 cm 6 s Ϫ1 ) 5 we find a quencher concentration of 100 ppm. Assuming the dominant quencher is OH, this is a reasonable value, as the colloids were prepared in a wet-chemical reaction.…”

“…For example, OuH is known to quench the luminescence due to the coupling of the excited state of the ion to vibrational modes of the OuH bond. [5][6][7] In this section, we study the optical properties of different Er-doped polydentate hemisperands, which form an overall neutral complex in which the Er 3ϩ ion is encapsulated in a cage-like ligand configuration. Clear, room-temperature PL at 1.54 m is observed for these complexes with a luminescence lifetime up to 0.8 s. Selective deuteration experiments are carried out to study the possible quenching effect of CuH bonds.…”

The near-infrared optical properties of an Nd (III) complex and its potential application in electroluminescence

“…For instance, the luminescence is usually quenched by hydroxyl groups in the system due to coupling of the excited state of lanthanide ion with high-energy vibrational modes of the O-H bond [6]. The ligand 1-phenyl-3-methyl-4-isobutyryl-5-pyrazolone (PM) is easy to coordinate with Nd 3+ ion and form a stable complex with triphenyl phosphine oxide (TP) as the neutral ligand.…”