Resumen de Material hibrido organiko-ez-organiko fluoreszenteak aplikazio optikoetarako
- English
In the search of new hybrid materials suitable for optical applications, dif-ferent dyes were occluded into the MgAPO-11 inorganic aluminophosphate. This zolitic material has an AEL structure type containing very narrow one-dimensional nan-ochannels with a diameter of 6.5 × 4 Å2. Thus, taking into account the molecular dimensions of the dyes to be encapsulated herein, they will get tightly occluded into the inorganic host structure. For this reason, dyes must be added to the initial synthesis gel in order to success in the incorporation of those chromophores into the material. With this synthetic approach, chromophores are encapsulated in a highly ordered ar-rangement into the nanochannels of the big particles of the AEL structure, exceeding 10 μm in length, forcing the dye molecules to place with their long molecular axis par-allel with respect to the channels’ direction. Furthermore, the narrow size of the chan-nels avoids dye aggregation into the aluminophosphate. Firstly, acridine (AC) and py-ronin Y (PY) dyes were simultaneously encapsulated into the inorganic zeolitic host obtaining a highly fluorescent hybrid material. Moreover, as the transition dipolar mo-ments of the two dyes are perpendicular to each other, and since an efficient FRET en-ergy transfer takes place between them, a fluorescence emission colour-switching of the particles is seen under UV excitation light (from cyan to green) depending on the direction of the polarizers placed before detection. Finally, a different dye was oc-cluded into the MgAPO-11, the LDS 722 dye, and as a result a highly fluorescent hy-brid material emitting in the red edge of the electromagnetic spectrum was achieved. Its fluorescence quantum yield is around 50 times higher than that recorded for the dye in aqueous solution and, given that the LDS 722 shows intrinsic Non-Linear Optical properties, together with the fact that the chromophore molecules show a ordered ar-rangement into the system, an appropriate hybrid material for Second Harmonic Gen-eration (SHG) has been obtained
- euskara
Aplikazio optikoetarako material hibrido egokiak aurkitu nahian, koloratzaile desberdinak MgAPO-11 aluminofosfato ez-organikoan kapsulatu dira. Material zeolitiko honek AEL egitura dauka, dimentsio bakarreko nanokanal eliptiko oso estuak dituena, 6.5 x 4 Å2-ko diametrodunak; beraz, erabiliko diren koloratzaileen neurri molekularra kontuan izanik, oso estu kapsulatuak geratuko dira. Hori dela eta, koloratzailea sintesi-nahastera gehitzea beharrezkoa da kapsulatuak gera daitezen. Sintesi-metodo horren bidez koloratzaileak modu oso ordenatuan AELaren kanaletan harrapatzen dira 10 µm baino gehiagoko luzeradun partikuletan, euren ardatz molekular luzearekin kanalekiko paralelo, eta koloratzaile molekulen agregazioa saihesten da. Alde batetik, akridina (AC) eta pironina Y (PY) kromoforoak material zeolitikoan batera kapsulatu direnean, material hibrido oso fluoreszentea lortu da. Gainera, bi kromoforoen trantsizio-momentu dipolarrak bata bestearekiko perpendikularrak direnez, eta haien artean FRET energia-transferentzia eraginkorra gertatzen denez, partikulen emisio fluoreszentearen kolore-aldaketa ikus daiteke (zianetik berdera) materiala argi ultramorearekin kitzikatu ostean, bide optikoan detekzioaren aurretik koka daitezkeen polarizatzaileen norabidearen arabera. Azkenik, LDS 722 koloratzailea sartu da euskarri ez-organikoan eta emaitza gisa espektro elektromagnetikoaren alde gorrian igortzen duen material hibrido oso fluoreszentea eskuratu da. Bere etekin kuantikoa koloratzaileak disoluzio urtsuan azaltzen duena baino 50 bat aldiz altuagoa da, eta gainera, LDS 722ak optika ez-linealerako propietate intrintsekoak dituenez, eta partikuletan molekulek duten ordenamendu maila altua dela eta, material hibrido egokia lortu da bigarren harmonikoaren sorkuntzarako (SHG).
