Structural defects and photoluminescence studies of sol–gel prepared ZnO and Al-doped ZnO films

Sandeep, K.; Bhat, Shreesha; Dharmaprakash, S. M.

doi:10.1007/s00339-016-0512-y

Cited by 22 publications

(4 citation statements)

References 27 publications

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“…Moreover, ZnO is available in large scale, chemically stable and eco‐friendly. At room temperature, the ZnO PL spectrum typically exhibits one emission peak in the ultraviolet (UV) region due to free exciton recombination and a low intensity broad emission in the visible range, associated to point defect states transitions, such as vacancies (V o and V Zn ), interstitials (O i and Zn i ) and antisites (O Zn and Zn O ) . Experimental works, theoretical studies and simulations linking defects energy level and formation energy led to some arguable hypothesis with no consensus about their origin.…”

Section: Figurementioning

confidence: 99%

“…Experimental works, theoretical studies and simulations linking defects energy level and formation energy led to some arguable hypothesis with no consensus about their origin. Nonetheless, the importance of its use as emissive layer (EML) for white light generation was recognized and LEDs were built having ZnO films deposited by low‐pressure thermal evaporation . Recently, polymer/inorganic hybrid LED having ZnO nanoparticles and nanorods, Fe 3 O 4 and TiO 2 , for example, were obtained, because of their enhanced optical and electrical properties in comparison to pure polymer system …”

Section: Figurementioning

confidence: 99%

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White Electroluminescence from Aluminum Zinc Oxide Embedded in Poly(9‐vinylcarbazole)

et al. 2019

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Simple methods for manufacturing white light‐emitting diodes (WLEDs) based on ZnO are still challenging researchers. Solution processed WLEDs based on Al doped ZnO (AZO) nanoparticles embedded in PVK (hybrid system) are demonstrated here, and PL studies of the hybrid system suggest that defects in AZO and PVK/AZO interface are likely to be the origin of white EL. Besides electrical conductivity increment, AZO provided the emissive layer with a more balanced charge injection; thus, the threshold voltage reduced from 8.1 V to 7.5 V and EL enhanced from 4.47 cd/m2 to 18.69 cd/m2 at 10 V, for the pure PVK compared to the hybrid system, respectively.

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Section: Figurementioning

confidence: 99%

Section: Figurementioning

confidence: 99%

White Electroluminescence from Aluminum Zinc Oxide Embedded in Poly(9‐vinylcarbazole)

et al. 2019

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“…A Tabela 2 mostra o posicionamento e as origens propostas para a fotoluminescência do ZnO. [26][27][28].…”

Section: Emissão Dos Defeitos Do Azounclassified

“…Figura 66 mostra o espectro de fotoluminescência do AZO disperso em clorofórmio, excitado em 320 nm com auxílio de um filtro de 360 nm. Podem-se observar duas bandas de emissão com picos em 377 nm, que envolvem transições entre as bandas de condução e de valência do AZO (near band edge -NBE), e 580nm, que está relacionado à emissão devido à existência de defeitos[28]. Além disso, notou-se que a intensidade de emissão na região do UV foi quase oito vezes maior que a intensidade de emissão na região do visível.…”

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Sistemas poliméricos semicondutores para aplicação como camada ativa em LED.

Oide¹,

Wang²

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Polymer light emiting diodes (PLEDs) were manufactured using poly(9vinylcarbazole) (PVK), poly(9,9-dioctylfluorene) (PFO) and poly(9,9-dioctylfluorenealt-1,4-fluorphenylene) (PF PF ) doped with different concentrations of tris-(2phenylpyridinate) iridium(III) [Ir(ppy) 3 ],a phosphorescent dye, as the active layer.Results showed that PFO based devices doped with 4 wt. % of Ir(ppy) 3 presented the highest current and power efficiencies, and the PVK based devices' electroluminescence spectrum showed an emission centered at 540 nm, suggesting that a charge unbalance and light emission from the injection layer of aluminum doped zinc oxide (AZO) occurred. Therefore, studies based on the PVK:AZO system and different PVK's average molar masses were elaborated to observe the PLEDs' electrical and optical properties. Results showed that AZO is a photo/electroluminescent material and it is responsible for the broad emission in the visible range. The hybrid device showed near pure white light emission and its purity reached 0.19.

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Effect of Al doping on the carrier transport characteristics of TiO2 thin films anchored on glass substrates

Bhat

Sandeep²,

Kumar

et al. 2019

Appl. Phys. A

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Structural defects and photoluminescence studies of sol–gel prepared ZnO and Al-doped ZnO films

Cited by 22 publications

References 27 publications

White Electroluminescence from Aluminum Zinc Oxide Embedded in Poly(9‐vinylcarbazole)

White Electroluminescence from Aluminum Zinc Oxide Embedded in Poly(9‐vinylcarbazole)

Sistemas poliméricos semicondutores para aplicação como camada ativa em LED.

Effect of Al doping on the carrier transport characteristics of TiO2 thin films anchored on glass substrates

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