Yellow light-emitting polymer bearing fluorescein dye units: Photophysical property and application as luminescence converter of a hybrid LED

Effect of zinc oxide incorporation on the morphology of tris(8-hydroxyquinoline)aluminum/zinc oxide hybrid nanomaterials

“…The PL spectrum of pure ZnO nanoparticles illustrates their characteristic blue band edge emission at around 380 nm with a weak and broad deep level emission in the visible region. Deep level emission was observed due to the structural defects in the ZnO nanoparticles mainly from the oxygen deficiency [25,28]. The enhanced PL intensity with a blue-shift emission of Alq 3 -ZnO hybrid nanomaterials is in good agreement with previous reports [23,27].…”

“…In order to make the perfect functional hybrids of organic-inorganic materials, we selected defective zinc oxide (ZnO) because of its very high oxygen vacancies and other In this laboratory, we have been synthesizing various types of yellow light-emitting polymers containing fluorescein dye units [22]. The photoluminescence (PL) emission efficiencies have been improved by incorporating ZnO nanoparticles as core-shell type hybrid materials [23][24][25]. Continuing this work, we selected green emitting low molecular weight amorphous Alq 3 to enhance their PL emission efficiency by addition of a few weight percentages of ZnO nanoparticles.…”

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

“…For example, a minimum 10 wt% of pure FTBT polymer is required to achieve near white emission with respect to epoxy. On the other hand, with just 2 wt% of Sample D hybrid is good enough to make white light emission with higher brightness [24,26]. region, respectively.…”

“…In our previous work, we have demonstrated the various polyester-type yellow-emitting fluorescent polymers synthesized from the fluorescein dye, as luminescence converter (LUCO) materials [23][24][25][26]. In continuation with this, to enhance their luminescence emission efficiency, we attempted to prepare hybrid nanomaterials with the help of DL emissive ZnO.…”

Vertically-stacked LEDs with invariance of color Chromaticity

“…Spectral conversion schemes, including phosphors [1e4], polymer dyes [5,6], and CdSe/CdS quantum dot [7e9] are commonly used to produce white light emission. However, these schemes inevitably suffer from energy loss due to Stokes shift in the downconversion processes, and scattering losses associated with the particles.…”