Easy control of electronic and optical properties of ZnO is pivotal for its various optoelectronic applications. The present manuscript illustrates preparation of flower- and needle-like microstructures of ZnO by simple hydrothermal technique using Zn(NO₃)₂ and NaOH as precursors. The method is found to be suitable to generate different ZnO microstructures just by changing NaOH concentration. Other parameters such as reaction temperature, time have no significant effect other than change of size of the microstructures. After careful analyses of the microstructures by Raman spectroscopy, it appears that charge carrier—LO phonon interaction which plays important role in optoelectronic properties decreases with increasing NaOH concentration. Photoluminescence spectroscopic data depict that the synthesized microstructures exhibit intense and tunable orange emission at 620 nm, attributed to interstitial oxygen defects. The present protocol is found to be very effective to control defects of ZnO microstructures; particularly, it seems to be very sensitive to control oxygen interstitial. Full width at half maxima (FWHM), an important parameter of any optical emission, is observed to be decreasing with increasing NaOH. A theoretical model, developed on the basis of Huang—Rhys ‘S’ factor, has been developed to correlate the trend of FWHM considering charge carrier—LO phonon interaction and orbital radii of the charge carriers.

易于控制ZnO的电子和光学特性对其各种光电应用至关重要。本手稿说明了使用Zn（NO ₃）_2的简单水热技术制备ZnO的花状和针状微结构的方法。和NaOH作为前体。发现该方法仅通过改变NaOH浓度就适合于产生不同的ZnO微结构。其他参数，例如反应温度，时间，除了改变微结构的尺寸外，没有其他影响。在通过拉曼光谱对微观结构进行仔细分析之后，似乎在光电性能中起重要作用的电荷载体-LO声子相互作用随着NaOH浓度的增加而降低。光致发光光谱数据表明，合成的微结构在620 nm处显示出强烈且可调的橙色发射，这归因于间隙氧缺陷。发现本协议对于控制ZnO微结构的缺陷非常有效。特别是控制氧间隙似乎非常敏感。观察到半峰全宽（FWHM）（任何光发射的重要参数）都随着NaOH的增加而减小。建立了基于黄-Rhys'S'因子的理论模型，以考虑电荷载流子-LO声子相互作用和电荷载流子的轨道半径来关联FWHM的趋势。