Luminescent Properties of ${\rm Lu}_{2}{\rm SiO}_{5}{\hbox{:}}{\rm Ce}$ Phosphors Codoped With Li Ions

Role of Li+ion in the luminescence enhancement of lanthanide ions: favorable modifications in host matrices

“…5,6 Ce 3+ and Eu 2+ are widely used activator ions for phosphor applications. [7][8][9][10][11][12][13][14][15][16][17][18][19] Their characteristic transition is 4f-5d, which is an allowed transition and has a lifetime on the order of nanosecond. Since the 5d orbitals are strongly affected by the crystal eld and polarizability of the host crystal, these transitions (4f-5d transitions) can be easily tuned to the visible region by changing the crystal composition and structure.…”

The mechanism of enhanced luminescence in ion-codoped Lu2SiO5:Ce3+ phosphors

“…Recently, more and more attention has been paid to improve its scintillation properties. Ion codoping is an effective technique to ameliorate the properties of LSO:Ce [2][3][4][5][6][7]. It was reported that Ca or Mg codoping could enhance the light yield, shorten the decay time and suppress the afterglow for LSO:Ce crystals [2,3].…”

“…It was reported that Ca or Mg codoping could enhance the light yield, shorten the decay time and suppress the afterglow for LSO:Ce crystals [2,3]. Na or Li codoping also resulted in an enhanced luminescence for LSO:Ce phosphors [4,5]. The light yield and energy resolution of LSO crystals were significantly affected by La or Sc codoping [6].…”

On the Role of Li+ Codoping in Simultaneous Improvement of Light Yield, Decay Time, and Afterglow of Lu2SiO5:Ce3+ Scintillation Detectors

“…It was reported that LSO:Ce polycrystalline phosphors codoped with Li + has an enhanced photoluminescence emission as the result of alteration of crystal field surrounding Ce and the increased population of stable Ce 3+ ions . Nonetheless, to the best of our knowledge, the study of impacts of Li + codoping on LSO:Ce scintillation characteristics and the roles of Li codopant in scintillation mechanism is lacking.…”

“…This deduction is also supported by the fact that the intensity of the Ce2 emission is reduced in the Li‐codoped sample. The energy transfer effect induced by Li codoping is consistent with earlier experiments on Li‐codoped LSO phosphors . Since a weighted combination of Ce1 and Ce2 decay time contributes to the scintillation decay time observed under gamma‐ray excitation, it is expected that the reduction of slow Ce2 emission is responsible for the scintillation decay time shortening observed in Li‐codoped LSO:Ce.…”