Hybrid fluorescent polymer–zinc oxide nanoparticles: Improved efficiency for luminescence conversion LED

Dynamic Rapid Synthesis of Bis(2,2'-bipyridine)nitrato Zinc (II) Nitrate Using a Microwave Method and its Application to Dye-Sensitized Solar Cells (DSSC)

“…The turn-on voltage of this LED was about 3.70 V at 100K, which approached the band gap of ZnO, and the electroluminescence spectra exhibited two bands at 423 and 523 nm. On the other hand, Hong et al 11 showed that a device containing 20 wt % of a ZnO incorporated hybrid material (2 wt %) emitted nearly pure white light and a total luminous flux of 1.80 lm at an operating voltage of 20 mA. The lifetime measurement data of the fabricated device containing the polymer-ZnO hybrid materials exhibited significant improvements over its pure counterpart because of the "caging effect" of the ZnO shell, which reduced the self-quenching of the polymer molecules in the core.…”

“…Over the last few years, considerable efforts have been focused on the design and synthesis of zinc complexes, which have attracted extensive interest in many fields, such as blue or green emitting materials in LEDs (light emitting diodes). [9][10][11] Particularly, Zhang et al 10 fabricated a ZnO LED by depositing undoped n-type ZnO onto a p-type layer. The turn-on voltage of this LED was about 3.70 V at 100K, which approached the band gap of ZnO, and the electroluminescence spectra exhibited two bands at 423 and 523 nm.…”

Fluorescent nanopigments: Quantitative assessment of their quantum yield

“…[1][2][3][4][5][6][7][8] Moreover, functionalizing the external surface of the these fluorescent nanoparticles and embedding them into a dielectric ͑e.g., polymer͒ matrix has enabled the realization of a large variety of novel optophotonic devices. [9][10][11][12][13][14] Recently, due to the wealth of existing organic fluorescent dyes, their encapsulation into either an inorganic or an organic host has been demonstrated to be a very promising and versatile approach to synthesize a large palette of new fluorescent pigments.…”

“…In particular, both organic-inorganic [14][15][16] and organic-organic [17][18][19] host-guest nanosystems have been extensively developed for the chemical, photochemical or thermal stabilization and the supramolecular organization of organic fluorescent dye molecules, complexes, and clusters. [19][20][21][22][23][24][25] The most common examples of such systems are ͑i͒ nanoporous zeolites: besides their widespread commercial use as catalysts and ion-exchangers, 26 due to their nanoporous framework consisting of nanochannels with a minimal diameter of several angstrom, they have been used as inorganic hosts for the encapsulation of different organic molecules, 2,20-22,27-31 ͑ii͒ mesoporous silica particles: because of their uniform porosity, they have been recently proposed as promising inorganic hosts with an adjustable pore size in the range of 1-10 nm, 32-35 ͑iii͒ silica nanoparticles: once loaded with fluorescent organic dyes, these inorganic nanohosts have been shown to possess interesting physical-chemical and photochemical properties, [36][37][38][39][40] ͑iv͒ fluorescent polymer nanoparticles: as stable organic hosts, they have attracted both research 6,8,[17][18][19]23,25,41 and commercial 42 interest for the development and the fabrication of novel functional materials; ͑v͒ organic-organic supramolecular complexes: they have been developed using organic macromolecules as hosts that can encapsulate small organic molecules or ions. 43,44 Due to their high versatility, these host-guest systems offer a wide range of possibilities for preparing nanopigments with tailored chemical and physical properties.…”

Effect of the method of production of the inorganic matrix on the spectral characteristics of hybrid ZnO/MEH-PPV nanocomposites

“…Our interest in the subject was due to the fact that the conditions of synthesis of the zinc oxide have a significant effect on its structure (particle size, surface morphology, number of defects) and, therefore, on its optoelectronic characteristics [2,5,6]. This is particularly important in the case of hybrid materials in so far as inorganic nanoparticles in such nonuniform media can have an effect on the position of the energy levels of the inorganic polymer [7]. …”