Role of defect states in the luminescence properties of ZnO

Kaur, Prabhpreet; Rani, Suman; Lal, Bansi; Nelson, Annu Maria

doi:10.1063/1.5120929

Cited by 2 publications

(1 citation statement)

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“…The visible emission spectra in ZnO are due to the defect center in the energy band such as vacancies of oxygen, doubly ionized Zn vacancy, and Zn interstitial and antisite oxygen in ZnO. Green emission around 500 nm is due to the singly ionized oxygen vacancy which is a donor state [7][8]. The yellow emission is frequently thermally unstable and is usually attributable to an absorbed hydroxyl group and interstitial oxygen.…”

Section: Experimental Detailmentioning

confidence: 99%

Defect Induced high-color-rendering white light emissions from Ag-doped ZnO

Jayaprakash,

Bakshi,

Rani

et al. 2024

IOP Conf. Ser.: Earth Environ. Sci.

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It is crucial to find high-quality white-light phosphors that are simple to synthesize in order to create efficient lighting. In this pursuit, the focus has been on achieving the emission of white light in ZnO and Ag-doped ZnO emerging as a promising phosphor candidate. The optimized ZnO nano phosphors demonstrated visible-light emission with ideal Commission international de I E “Eclairage frequently abbreviated as coordinates (x = 0.33, y = 0.33 ) and a correlated color temperature of 6200 K, and a color rendering index of 100 for equivalent to day white light. Furthermore, under certain ideal processing conditions, neutral white-light emission (x = 0.33, y = 0.33 at λex = 280 and 370 nm) with a Color correlated temperature (CCT) of 5500 K(approx.) was achieved. The Color Rendering Index (CRI) of the ZnO and Ag:ZnO nanoparticles exceeded 90, with high values approaching 96%, which is necessary for accurately portraying object colors in comparison to natural sunshine. The research findings revealed a decrease in the FS emission intensity with all the UV excitation when Ag doped in ZnO, which aligns well with the principles of Stern-Volmer quenching. A reduction in intensity was observed which may be due to the Ag dopant interacting with the luminescent nanoparticles and causing a reduction in their emitted light. The study successfully develops and optimizes ZnO-based nano phosphors with tailored white-light emission characteristics, presenting a promising solution for achieving energy-efficient and high-quality white-light sources for various lighting applications.

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Section: Experimental Detailmentioning

confidence: 99%