Effects of annealing on the structure and photoluminescence of ZnO-sputtered coaxial nanowires

Kim, Hyoun Woo; Kebede, Mesfin Abayneh; Kim, Hyo Sung; Kong, Myung Ho; Lee, Chongmu

doi:10.1016/j.jlumin.2009.03.030

Cited by 10 publications

(1 citation statement)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Hence post annealing has a major role in compensating the defects and vacancies [25]. Several research groups have studied the influence of the annealing temperature on the photoluminescence properties of ZnO nanocrystals [26,27]. Zhang et al [28] proposed that at an annealing temperature range of 300-600°C, the green luminescence band becomes the strongest one.…”

Section: Introductionmentioning

confidence: 99%

Band gap tailoring and enhanced visible emission by two-step annealing in Zn0.94Cu0.04Cr0.02O nanocrystals

Sangeetha

Muthukumaran²

2015

J Mater Sci: Mater Electron

View full text Add to dashboard Cite

Zn 0.94 Cu 0.04 Cr 0.02 O nanocrystals were synthesized by co-precipitation method and the effects of annealing at 600°C and 800°C under two steps on the structural, optical and morphological properties were investigated systematically. X-ray diffraction pattern showed the secondary phases such as CuO and ZnCr 2 O 4 were found at 600 ? 800°C annealed sample. In addition, I (002) /I (100) ratio became almost equal to 1 at 600 ? 800°C which described the grains with lower surface energy became larger. Chemical composition of the samples was confirmed by energy dispersive X-ray spectra. The variation of absorption peaks between 473 and 556 cm -1 and the shift of absorption frequency towards the lower side by annealing revealed that Zn-O-Zn network is perturbed by the presence of Cu/Cr in its environment. Absorption intensity and blue shift of energy gap were discussed based on size, defects and secondary phase formation. The broad transmittance spectra noticed around visible region illustrated the presence of oxygen related defects and Cu/Cr interstitials. I green /I blue ratio is increased with increase in annealing temperature. The noticed high value of this ratio at 800°C confirmed the existence more defect related states.

show abstract

Section: Introductionmentioning

confidence: 99%

Band gap tailoring and enhanced visible emission by two-step annealing in Zn0.94Cu0.04Cr0.02O nanocrystals

Sangeetha

Muthukumaran²

2015

J Mater Sci: Mater Electron

View full text Add to dashboard Cite

show abstract

Charge‐Transporting Polymers based on Phenylbenzoimidazole Moieties

Debeaux

Thesen

Schneidenbach

et al. 2010

Adv Funct Materials

View full text Add to dashboard Cite

A series of novel styrene functionalized monomers with phenylbenzo[d]imidazole units and the corresponding homopolymers are prepared. These side‐chain polymers show high glass‐transition temperatures that even exceed the corresponding value for the common electron‐transporting material 1,3,5‐tris(1‐phenyl‐1H‐benzo[d]imidazol‐2‐yl)benzene (TPBI). Similar electronic behavior between the polymers and TPBI is shown. The polymers are used as matrices for phosphorescent dopants. The fabricated devices exhibit current efficiencies up to 38.5 cd A−1 at 100 cd m−2 and maximum luminances of 7400 cd m−2 at 10 V with a minimum turn‐on voltage as low as 2.70 V in single‐layer devices with an ITO/PEDOT:PSS anode (ITO = indium tin oxide, PEDOT:PSS = poly(3,4‐ethylenedioxythiophene) doped with poly(styrenesulfonate)) and a CsF/Ca/Ag cathode.

show abstract

Influence of annealing temperature on the photoluminescence properties of ZnO quantum dots

Zhang

Hou

Mao

et al. 2010

Applied Surface Science

View full text Add to dashboard Cite

Effects of annealing on the structure and photoluminescence of ZnO-sputtered coaxial nanowires

Cited by 10 publications

References 16 publications

Band gap tailoring and enhanced visible emission by two-step annealing in Zn0.94Cu0.04Cr0.02O nanocrystals

Band gap tailoring and enhanced visible emission by two-step annealing in Zn0.94Cu0.04Cr0.02O nanocrystals

Charge‐Transporting Polymers based on Phenylbenzoimidazole Moieties

Influence of annealing temperature on the photoluminescence properties of ZnO quantum dots

Contact Info

Product

Resources

About