Microwave-assisted preparation of uniform pure and dye-loaded AlPO4-5 crystals with different morphologies for use as microlaser systems

Abstract

The study of the influence of the crystal morphology of laser dye-loaded AlPO 4 -5 molecular sieve on the previously reported laser properties, i.e., laser threshold power density, modes of laser emission and lightfastness, requires synthesis procedures resulting in single crystals of varied length-per-width ratios. The suppression of undesired side-phases (AlPO 4 -8, VPI-5), as well as the temperature-time field, for the production of pure Rhodamine BE50-loaded crystals with desired uniform morphology by the microwave-heated crystallization method are evaluated and discussed. Uniform plate-like crystals with a thickness of less than 4 mm, for which favorable laser properties can be expected, are obtained only in a small temperature window 150¡5 uC with reaction times of about 10 minutes.

Panchromatic Chromophore Mixtures in an AlPO4‐5 Molecular Sieve: Spatial Separation Effects and Energy Transfer Cascades

“…A large variety of simultaneous phases of AlPO 4 -5, AlPO 4 -8, and the dense phase T-AlPO 4 (a tridymite analogue of aluminum phosphate) are formed, frequently as intergrowths between the different phases. [20] If the microwave-assisted crystallization is carried out at 155 C, an AlPO 4 -5 phase to can be isolated after a reaction time of about 5 min, as proved by X-ray diffraction. [20] AlPO 4 -5 crystals with a hexagonal plate-like morphology are formed (Fig.…”

“…[20] If the microwave-assisted crystallization is carried out at 155 C, an AlPO 4 -5 phase to can be isolated after a reaction time of about 5 min, as proved by X-ray diffraction. [20] AlPO 4 -5 crystals with a hexagonal plate-like morphology are formed (Fig. 2a).…”

Influence of Reaction pH towards the Physicochemical Characteristics of Phosphorylated Polyvinyl Alcohol-Aluminum Phosphate Nanocomposite

“…Hence, the PPVA-AlPO 4 nanocomposite samples consist of spherical particles with laminar layers. The observed changes to the particle size, layer phase, and associated morphology of PPVA-AlPO 4 nanocomposite (Figures 5-7) are discussed considering the formation of AlPO 4 which can directly influence the concentration building unit (Al−OH and Al−PO 4 ) in the reaction mixture [20]. In addition, the influence of pH on the ionization of phosphoric acid to dihydrogen phosphate, hydrogen phosphate, and conjugate base PO 4 3− is also affected due to the alkaline environment, i.e., phosphoric acid to PO 4 3− is maximized at pH > 7 [17].…”

Kompostite auf Basis von Zeolithen oder geordnet mesoporösen Oxiden für Anwendungen in der Photonik und Sensorik

“…2 zeigt einen verwachsenen AlPO 4 -5/ AlPO 4 -8-Kristall, der mit Rhodamin BE50 beladenen wurde. Der hexagonale AlPO 4 -5-Grundkörper ist intensiv gefärbt, wohingegen die Al-PO 4 -8-Antennen farblos sind [2]. Der Farbstoff wird ausschließlich in die AlPO 4 -5-Kristalle eingelagert, wohingegen die AlPO 4 -8-Kristalle keine Farbstoffe aufnehmen.…”

“…Nicht alle viel versprechenden Ansätze zur Funktionalisierung konnten aufgenommen werden, die hier aufgeführten Betrachtungen gehen zumeist von eigenen Arbeiten aus und werden dann durch aktuelle Forschungsergebnisse anderer Autoren ergänzt. [2]. Wird die Kristallisation bei 150°C in der Mikrowelle durchgeführt, lassen sich schon nach 10 min plättchenförmige hexagonale Al-PO 4 -5-Kristalle finden.…”