Fluorescence properties of a novel side-chain polymer based on polyamic acid

Lu, Jianmei; Yao, Shechun; Tang, Xiubo; Sun, Ming; Zhu, Xiulin

doi:10.1016/j.optmat.2003.08.002

Cited by 7 publications

(1 citation statement)

References 11 publications

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“…Methods for producing crystalline KPb 2 Cl 5 and a documentation of its basic properties were reported in 1995 by Nitsch et al [27]. Interest in incorporating rare earth ions into KPb 2 Cl 5 has lead to further refinements of material preparation and crystal growth techniques [28-31]. …”

Section: Methodsmentioning

confidence: 99%

Use of thulium-sensitized rare earth-doped low phonon energy crystalline hosts for IR sources

Ganem

Bowman

2013

Nanoscale Res Lett

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Crystalline hosts with low phonon energies enable novel energy transfer processes when doped with rare earth ions. Two applications of energy transfer for rare earth ions in thulium-sensitized low phonon energy crystals that result in infrared luminescence are discussed. One application is an endothermic, phonon-assisted cross-relaxation process in thulium-doped yttrium chloride that converts lattice phonons to infrared emission, which raises the possibility of a fundamentally new method for achieving solid-state optical cooling. The other application is an optically pumped mid-IR phosphor using thulium-praseodymium-doped potassium lead chloride that converts 805-nm diode light to broadband emission from 4,000 to 5,500 nm. These two applications in chloride crystals are discussed in terms of critical radii calculated from Forster-Dexter energy transfer theory. It is found that the critical radii for electric dipole-dipole interactions in low phonon energy chloride crystals are comparable to those in conventional oxide and fluoride crystals. It is the reduction in multi-phonon relaxation rates in chloride crystals that enable these additional energy transfer processes and infrared luminescence.

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Section: Methodsmentioning

confidence: 99%