Farbzentren in Diamanten

Radiation effects on solids, including catalysts

“…using radon and radium salts. Later work with neutrons, electrons, and deutrons has revealed more details of the traps produced by displacement, using absorption spectroscopy (28) and paramagnetic resonance (29). The lack of widespread interest in valence crystals, in spite of their relative simplicity and adaptability to optical measurements, probably arises largely from the scarcity of different substances of this type, with a corresponding lack of opportunity to compare similar phenomena over a wide range of small variations.…”

Luminescence of negatively charged single vacancies in diamond: ND1 center

“…When charged negatively, single vacancies are detected as the ND1 center (ZPL at 393.5 nm at liquid nitrogen temperature). The ND1 center was reported for the first time in [1]. It was studied and labeled as ND1 in [2].…”

Solid-State Semiconductor Optical Cryocooler Based on CdS Nanobelts

“…Optical refrigeration or laser cooling of solids based on the anti-Stokes luminescence was first proposed by Pringsheim in 1929. , Unlike the laser cooling of diluted atoms where the translational energy of atoms is removed via the interaction with the laser field, laser cooling of solids is achieved by taking away the lattice vibrational energy during the anti-Stokes emission process, i.e., annihilation of phonons. ,, To realize the laser cooling of solids, the material requires having high crystalline quality with properly spaced energy levels and high external quantum efficiency. , Due to those stringent requirements, laser cooling of solids experienced much greater challenges in materials than laser cooling of atoms. The net laser cooling of solids has not been achieved until 1995 when Epstein and co-authors demonstrated the first laser cooling in ytterbium-doped glasses .…”