Luminescence from Zinc Oxide Nanostructures and Polymers and their Hybrid Devices

Abstract

Zinc oxide (ZnO) is a strong luminescent material, as are several polymers. These two materials have distinct drawbacks and advantages, and they can be combined to form nanostructures with many important applications, e.g., large-area white lighting. This paper discusses the origin of visible emission centers in ZnO nanorods grown with different approaches. White light emitting diodes (LEDs) were fabricated by combining n-ZnO nanorods and hollow nanotubes with different p-type materials to form heterojunctions. The p-type component of the hybrids includes p-SiC, p-GaN, and polymers. We conclude by analyzing the electroluminescence of the different light emitting diodes we fabricated. The observed optical, electrical, and electro-optical characteristics of these LEDs are discussed with an emphasis on the deep level centers that cause the emission.

Effect of NaOH concentration on optical properties of zinc oxide nanoparticles

“…Most important amongst all are its remarkable optical properties which allow ZnO to emit light in the entire visible region (from violet to red) [3]. Various workers [1,3,4] suggested that the presence of large number of extrinsic and intrinsic defects and complexes in the ZnO structure acts as emission centers. Depending upon the level and positions of these centers, ZnO is able to emit light in various colors such as violet, blue, green, yellow, orange and red [3,4].…”

“…Various workers [1,3,4] suggested that the presence of large number of extrinsic and intrinsic defects and complexes in the ZnO structure acts as emission centers. Depending upon the level and positions of these centers, ZnO is able to emit light in various colors such as violet, blue, green, yellow, orange and red [3,4]. Because of these remarkable * E-mail: 123105005 aibhav@manit.ac.in and peculiar properties, ZnO has a wide range of applications in the areas ranging from photovoltaic [5] to photocatalyst [6,7], from electronics [2] to medical sciences [2,7] and from cosmetics [5] to antibacterial applications [6].…”

“…The reasons for the keen interest in ZnO were attributed to its excellent properties such as easy synthesis, tunable bandgap [2], controllable shape and size, low cost of production and non-toxicity [2]. Most important amongst all are its remarkable optical properties which allow ZnO to emit light in the entire visible region (from violet to red) [3]. Various workers [1,3,4] suggested that the presence of large number of extrinsic and intrinsic defects and complexes in the ZnO structure acts as emission centers.…”

Effects of chemical stoichiometry of channel region on bias instability in ZnO thin-film transistors

“…1͑b͒, is attributed to the effects of excess Zn. [10][11][12] Stress-tests under various bias conditions were carried out for the TFTs with O-rich or Zn-rich ZnO. The mechanism of bias instability was elucidated by measuring the transfer characteristics when a gate bias stress between Ϫ20 and 30 V or a drain bias stress between 0 and 20 V was applied.…”

Влияние Термических И Плазменных Обработок На Фотолюминесценцию Пленок Оксида Цинка

“…Оксид цинка является перспективным материалом для применения во многих областях, таких, как светоиз-лучающие диоды, пьезоэлектрические структуры, тон-копленочные транзисторы [1][2][3]. Различные сенсоры на основе ZnO [4][5][6] благодаря своей реакции на широкий круг веществ весьма перспективны для практических применений и интенсивно исследуются.…”