Synthesis of TiO 2 spheres and their utilization in the enhancement light-extraction efficiency of WLEDs

Mun, Ju Young; Park, Jin Young; Kwak, Minseok; Moon, Byung Kee; Jang, Kiwan; Yang, Hyun Kyoung

doi:10.1016/j.materresbull.2017.06.037

Cited by 4 publications

(5 citation statements)

References 28 publications

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“…In some cases, solid and hollow TiO 2 spheres could be obtained by adjusting the synthesis process [50,80]. In addition, the application of TiO 2 microscale structures has been extended from wastewater treatment to other areas, such as controlled-release capsules, artificial cells, drug delivery, and even white-light-emitting diode (WLED) production [50,62]. However, due to the complexity of the synthesis process, microscale TiO 2 spheres and hollow spheres are not easily mass produced.…”

Section: Discussionmentioning

confidence: 99%

“…They observed that the mixed anatase and rutile spheres were collected at 800 • C. At higher temperatures (≥900 • C), the anatase was transferred to the rutile phase. Such spheres have been applied to produce white-light-emitting diodes (WLEDs) with 43.6% higher light extraction efficiency than WLED combinations of commercial YAG:Ce 3+ and blue LED chips [62].…”

Section: Tio 2 Solid Microscale Structuresmentioning

confidence: 99%

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Titanium Dioxide Microscale and Macroscale Structures: A Mini-Review

et al. 2020

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Titanium dioxide nanoparticles (TiO2 NPs) have some limitations, such as their low surface area, high bandgap energy, and low recycling ability. To overcome these limitations, TiO2 can be prepared in microscale/macroscale structures. TiO2 microscale structures, in comparison with TiO2 nanopowder, have higher surface areas, more tunable pore structures, and better top photocatalytic activity. In contrast, for TiO2 macroscale structures, although the surface area is lower than TiO2 nanopowder in many cases, they still achieve similar or better photocatalytic performance due to their unique properties. Moreover, both TiO2 microscale and macroscale structures can be easily recovered from reaction media. The difference between these two types of TiO2 structures is a function not only of size but also of the preparation process. Every type of TiO2 structure has its own advantages and disadvantages, as will be discussed further in the following pages. Future perspectives on this research field also will be discussed.

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Section: Discussionmentioning

confidence: 99%

Section: Tio 2 Solid Microscale Structuresmentioning

confidence: 99%

Titanium Dioxide Microscale and Macroscale Structures: A Mini-Review

et al. 2020

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“…Threedimensional (3D) TiO 2 microspheres (T) were synthesized via with solvothermal reaction. 16 The urea (3, 4, 5, 6 g) and 1.0 g of TiO 2 microspheres were evenly mixed with urea powder, and then the mixed powder was put into a quartz boat. It was heated to 550 °C in a muffle furnace at a linear heating rate of 15 °C/min and calcined for 4 h to form a g-C 3 N 4 phase.…”

Section: Methodsmentioning

confidence: 99%

“…Three-dimensional (3D) TiO 2 microspheres (T) were synthesized via with solvothermal reaction . The urea (3, 4, 5, 6 g) and 1.0 g of TiO 2 microspheres were evenly mixed with urea powder, and then the mixed powder was put into a quartz boat.…”

Section: Methodsmentioning

confidence: 99%

Ti₃C₂ Quantum Dots Modified 3D/2D TiO₂/g-C₃N₄ S-Scheme Heterostructures for Highly Efficient Photocatalytic Hydrogen Evolution

Dong

Zhang

Wang

et al. 2021

ACS Appl. Energy Mater.

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Photocatalytic hydrogen production is a promising technology to alleviate the problems of energy shortage and environmental pollution faced by human society. In this paper, the S-scheme heterojunction TiO 2 /g-C 3 N 4 was modified by Ti 3 C 2 quantum dots (QDs) to prepare a three-dimensional/two-dimensional/zero-dimensional (3D/2D/0D) photocatalyst for photocatalytic hydrogen production. The S-scheme heterojunction structure reduces the recombination rate of photogenerated electron−hole pairs and produces more photogenerated electrons. At the same time, Ti 3 C 2 quantum dots as electron acceptors improve the ability to capture transition electrons, obtain more photogenerated carriers involved in surface reactions, and increase the number of active sites. The TiO 2 /g-C 3 N 4 /Ti 3 C 2 QDs composite catalyst shows excellent photocatalytic hydrogen evolution performance under visible light due to its unique structure and optical properties. The photocatalytic hydrogen production rate reached the maxima of 5540.21 μmol•h −1 g −1 , which is nearly 2 times higher than the production rates observed for TiO 2 /g-C 3 N 4 . The structure of 3D/2D/0D TiO 2 /g-C 3 N 4 /Ti 3 C 2 QDs was constructed, and the electron transfer path was verified by transient absorption spectroscopy and density functional theory calculation. KEYWORDS: TiO 2 /g-C 3 N 4 composites, Ti 3 C 2 quantum dots, S-scheme heterojunction, photocatalytic hydrogen production, DFT calculation

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“…Recently, in order to enhance light extraction of GaN-based light emitting diodes (LEDs), which are the main components for micro- and mini-displays and solid-state lighting sources, TiO 2 nanomaterials including nanotubes, nanoparticles, spheres, and films with nano patterns have been suggested as potential candidates for use as light extracting technology. Among the reported various surface structures of TiO 2 nanomaterials used for the improvement of device performance in LEDs, nanorods (NRs) have been found superior to other structures such as spheres and nanosheets due to their high surface area and high collection ability of generated photons .…”

Section: Introductionmentioning

confidence: 99%

Transfer of a Well-Aligned TiO₂ Nanorod Array onto GaN-Based LEDs for Light Extraction Enhancement

et al. 2023

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We report on the application of a transferable titanium dioxide nanorod (TiO 2 NR) array as a light extraction booster for GaNbased light-emitting diodes (LEDs). A chemical lift-off process was used to create a self-separating TiO 2 NRs array, which was achieved during growth of TiO 2 NRs on a nickel (Ni)-metal-coated Si substrate. The array was transferred onto the topmost layer of the LED chip. The TiO 2 NR array/LEDs show the 66% enhancement of light output power (LOP) intensity compared with the reference LEDs at a fixed injection current of 100 mA. The transferable TiO 2 NR array formed on the LEDs is a very effective structure to increase light extraction by reduction of backward reflections of photons emitted from LEDs. Our suggested simple and practical method suggested by our team to facilitate self-separation of the transferable TiO 2 NRs array can be applied on various substrates for optoelectronic devices without additional damage or degradation of device performance.

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Synthesis of TiO 2 spheres and their utilization in the enhancement light-extraction efficiency of WLEDs

Cited by 4 publications

References 28 publications

Titanium Dioxide Microscale and Macroscale Structures: A Mini-Review

Titanium Dioxide Microscale and Macroscale Structures: A Mini-Review

Ti₃C₂ Quantum Dots Modified 3D/2D TiO₂/g-C₃N₄ S-Scheme Heterostructures for Highly Efficient Photocatalytic Hydrogen Evolution

Transfer of a Well-Aligned TiO₂ Nanorod Array onto GaN-Based LEDs for Light Extraction Enhancement

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Synthesis of TiO 2 spheres and their utilization in the enhancement light-extraction efficiency of WLEDs

Cited by 4 publications

References 28 publications

Titanium Dioxide Microscale and Macroscale Structures: A Mini-Review

Titanium Dioxide Microscale and Macroscale Structures: A Mini-Review

Ti3C2 Quantum Dots Modified 3D/2D TiO2/g-C3N4 S-Scheme Heterostructures for Highly Efficient Photocatalytic Hydrogen Evolution

Transfer of a Well-Aligned TiO2 Nanorod Array onto GaN-Based LEDs for Light Extraction Enhancement

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Product

Resources

About

Ti₃C₂ Quantum Dots Modified 3D/2D TiO₂/g-C₃N₄ S-Scheme Heterostructures for Highly Efficient Photocatalytic Hydrogen Evolution

Transfer of a Well-Aligned TiO₂ Nanorod Array onto GaN-Based LEDs for Light Extraction Enhancement