Cooperative effects of zinc interstitials and oxygen vacancies on violet-blue photoluminescence of ZnO nanoparticles: UV radiation induced enhanced latent fingerprint detection

Pramanik, Subhamay; Mukherjee, Souvik; Dey, Santanu; Mukherjee, Sumit; Das, Sandip; Ghosh, Tatan; Ghosh, Prasanta; Nath, Rajib; Kuiri, Probodh K.

doi:10.1016/j.jlumin.2022.119156

Cited by 26 publications

(4 citation statements)

References 63 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Steady state photoluminescence (PL) spectra under 330 nm UV excitation for the ZnO and FZnO films were also collected and are shown in Fig. 1 f. There are two distinguishable bands at 2.3 and 3.1 eV, which can be ascribed to emission from Shockley–Read–Hall (SRH) recombination at sub-bandgap states [ 46 , 47 ], and originating from oxygen vacancies and other defects such as zinc interstitials which lead to different states in ZnO films, respectively [ 48 – 50 ]. The PL intensity of both bands becomes lower in FZnO, an effect similar to that observed in Mg-doped ZnO [ 51 ], suggesting that the presence of the fluorine passivates the sub-bandgap states and reduces radiative electron–hole recombination.…”

Section: Resultsmentioning

confidence: 99%

Significant Lifetime Enhancement in QLEDs by Reducing Interfacial Charge Accumulation via Fluorine Incorporation in the ZnO Electron Transport Layer

et al. 2022

View full text Add to dashboard Cite

ZnO nanoparticles are widely used for the electron transport layers (ETLs) of quantum dots light emitting devices (QLEDs). In this work we show that incorporating fluorine (F) into the ZnO ETL results in significant enhancement in device electroluminescence stability, leading to LT50 at 100 cd m−2 of 2,370,000 h in red QLED, 47X longer than the control devices. X-ray photo-electron spectroscopy, time-of-flight secondary ion mass spectroscopy, photoluminescence and electrical measurements show that the F passivates oxygen vacancies and reduces electron traps in ZnO. Transient photoluminescence versus bias measurements and capacitance–voltage-luminance measurements reveal that the CF4 plasma-treated ETLs lead to increased electron concentration in the QD and the QD/hole transport layer interface, subsequently decreasing hole accumulation, and hence the higher stability. The findings provide new insights into the critical roles that optimizing charge distribution across the layers play in influencing stability and present a novel and simple approach for extending QLED lifetimes.

show abstract

Section: Resultsmentioning

confidence: 99%

Significant Lifetime Enhancement in QLEDs by Reducing Interfacial Charge Accumulation via Fluorine Incorporation in the ZnO Electron Transport Layer

et al. 2022

View full text Add to dashboard Cite

show abstract

“…In case of samples, ZnO/C_2, ZnO/C_5 and ZnO/C_10, we can see two intense peaks corresponding to carbon with negligible intensity of the Raman bands corresponding to ZnO. In figure 4(a), the two Raman peaks are seen at about 1345 cm −1 and 1606 cm −1 which are the well known D and G bands of carbon, respectively [23]. It is well known fact that the D band signifies the defects in CNPs, and the breathing modes of six-atom rings with A 1g symmetry is responsible for it [24], where the G band reflects the graphite nature with sp 2 bonding of carbon [25].…”

Section: Resultsmentioning

confidence: 87%

Vibrational, optical, and photocatalytic properties of ZnO/layered carbon nanocomposite synthesized by ball milling

Das,

Pramanik,

Mukherjee

et al. 2024

J. Phys.: Condens. Matter

Self Cite

View full text Add to dashboard Cite

ZnO/layered carbon nanocomposites with varied sizes of ZnO nanoparticles (NPs) were synthesized by mechanical milling of mixture of ZnO NPs and carbon NPs. The NP size of ZnO was controlled with average particle sizes about 19.33, 21.87, 24.21, and 27.89 nm by varying the concentrations of carbon NPs viz 0, 2, 5, and 10 weight percent, respectively, in the mixture. Presence of carbon with ZnO in the form of composite also resulted in the enhanced shift of the band gap of ZnO due to the optical transitions in the impurity states or presence of carbon as compared to the ZnO size change alone. Additionally, the enhancement of absorbance in the visible region with an increase in carbon content was observed. Such an increase in absorbance can enhance the photocatalytic activity of ZnO NPs. Raman bands for ZnO NPs also were found to shift faster in the presence of layered carbon. The quenching of visible photoluminescence emission of ZnO NPs with an increase in concentration of carbon NPs in the composite indicated the phenomenon associated with transfer of electrons from ZnO to layered carbon helping the separation of photo-generated electrons and holes in ZnO and can lead to enhancement of the photocatalytic activity of ZnO NPs. In the photocatalytic studies, it was observed that the degradation of methylene blue (MB) dye was significantly enhanced by the increase of content of layered carbon in the nanocomposite. The sample containing 10% carbon showed the highest adsorption in dark conditions which was up to 60% of the starting strength and this was further enhanced to 88% in the presence of UV radiation. Enhanced adsorption of MB dye and the effective separation of electron–hole pairs due to charge transfer were believed to be the main causes behind such kind of improvement in the photocatalytic effects.

show abstract

“…42 However, the presence of this signal in Zn 2 GeO 4 can be proposed due to defect complex formation or isolated cation vacancies (). 43–46 The intensity of the EPR signal due to and defects ( g ∼1.955) enhanced significantly in 0.01Pr samples that indicated large defect formation on Pr 3+ doping. This observation is in line with DFT calculations and also supports the PL results.…”

Section: Resultsmentioning

confidence: 99%

Trap engineering through chemical doping for ultralong X-ray persistent luminescence and anti-thermal quenching in Zn₂GeO₄

Balhara,

Gupta,

Abraham

et al. 2024

J. Mater. Chem. C

View full text Add to dashboard Cite

show abstract

Cooperative effects of zinc interstitials and oxygen vacancies on violet-blue photoluminescence of ZnO nanoparticles: UV radiation induced enhanced latent fingerprint detection

Cited by 26 publications

References 63 publications

Significant Lifetime Enhancement in QLEDs by Reducing Interfacial Charge Accumulation via Fluorine Incorporation in the ZnO Electron Transport Layer

Significant Lifetime Enhancement in QLEDs by Reducing Interfacial Charge Accumulation via Fluorine Incorporation in the ZnO Electron Transport Layer

Vibrational, optical, and photocatalytic properties of ZnO/layered carbon nanocomposite synthesized by ball milling

Trap engineering through chemical doping for ultralong X-ray persistent luminescence and anti-thermal quenching in Zn₂GeO₄

Contact Info

Product

Resources

About

Cooperative effects of zinc interstitials and oxygen vacancies on violet-blue photoluminescence of ZnO nanoparticles: UV radiation induced enhanced latent fingerprint detection

Cited by 26 publications

References 63 publications

Significant Lifetime Enhancement in QLEDs by Reducing Interfacial Charge Accumulation via Fluorine Incorporation in the ZnO Electron Transport Layer

Significant Lifetime Enhancement in QLEDs by Reducing Interfacial Charge Accumulation via Fluorine Incorporation in the ZnO Electron Transport Layer

Vibrational, optical, and photocatalytic properties of ZnO/layered carbon nanocomposite synthesized by ball milling

Trap engineering through chemical doping for ultralong X-ray persistent luminescence and anti-thermal quenching in Zn2GeO4

Contact Info

Product

Resources

About

Trap engineering through chemical doping for ultralong X-ray persistent luminescence and anti-thermal quenching in Zn₂GeO₄