Journal
SUPERLATTICES AND MICROSTRUCTURES
Volume 120, Issue -, Pages 363-369Publisher
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.spmi.2018.05.064
Keywords
Selective self-etching method; Nanopetals; Oxygen deficiency; Lattice strain; Polychromatic emission
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In this work, we report that flower shaped architecture of ZnO assembled by individual nano petals of an average thickness similar to 93 nm has been achieved by selective self - etching method. The presence of oxygen deficiency is confirmed by EDX and ATR measurements. ZnO nanopetals prepared at 80 degrees C exhibit enhanced polychromatic defect emissions of blue, green and red (BGR) as compared to samples annealed at higher temperatures. The improved luminescence emission of BGR is attributed to the higher lattice strain and dislocation density induced in ZnO due to native defects. As the annealing temperature is reduced, the dislocation density increases from 7.60 x 10(13) to 3.99 x 10(15) lines/m(2), whilst, lattice strain increases from 0.0079 x 10(-3) to 1.81 x 10(-3). The observed high luminescence emission is due to flower shaped architecture making it suitable for the fabrication of solid-state white light emitting diodes.
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