The nano crystalline hydroxyapatite with highly uniform spherical morphology has successfully been prepared
using the new cationic surfactant Cetrimide as template by co-precipitation method at ambient temperature. The sample
was calcinated at 750 °C for 8h. The FTIR spectrum shows the chemical composition of HAP. The XRD pattern
confirms the characteristic peaks and the hexagonal structure of HAP. The lattice parameters calculated from the XRD
pattern are a = b ~ 0.93873 nm, c = 0.68486 nm, the axial ratio ~0.7296, the volume of the unit cell ~522.6535x10-30
m3. The size and morphology of the sample were analyzed by FESEM, which shows that the spherical HAp particles
with diameter 150-200 nm have successfully been synthesized. All the inspections confirm the successful preparation
of nano spherical HAP with excellent morphology control, and uniform size.
Fluorescent polymer-zinc oxide hybrid (PZOH) materials were successfully prepared using simple chemical bath deposition method at low temperature. The formation of ZnO nanoparticles and their deposition on the surface of fluorescent polymer was confirmed by SEM and TEM images, which were further clarified by performing selected area diffraction patterns in TEM image that confirms the incorporation of crystalline ZnO material. The optical emission efficiency showed significant enhancement by employing different ratio of ZnO composition with respect to fluorescent polymer. Finally, bright and efficient white light emitting diodes have been fabricated using these PZOH, as a luminescence converter (LUCO) with the help of commercially available Nitride based blue LED, as a primary pumping source. The output light efficiency of PZOHs fabricated White LED showed drastic improvement when compared to pure fluorescent polymer, due to higher PL quantum efficiency (86 %) of PZOH then the pure fluorescent polymer (54 %).
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