The Influence of the Thermal Effect on CdSe/ZnS Quantum Dots in Light-Emitting Diodes

Chen, Kuo-Ju; Chen, Hsin-Chu; Shih, Min‐Hsiung; Wang, Chao-Hsun; Kuo, Mark Yen‐Ping; Yang, Y.J.; Lin, Chien-Chung; Kuo, Hao‐Chung

doi:10.1109/jlt.2012.2195158

Cited by 62 publications

(27 citation statements)

References 33 publications

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“…The FEM simulation is employed to simulate the temperature of blue chip and the phosphor layer [33]. First, the three simulated device structures are fabricated as shown in the top of Fig.…”

Section: Resultsmentioning

confidence: 99%

Effect of the Thermal Characteristics of Phosphor for the Conformal and Remote Structures in White Light-Emitting Diodes

et al. 2013

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The influence of the thermal effect of phosphor for conformal and remote structures in white light-emitting diodes was investigated using the junction and phosphor temperatures. Comparing the measured temperatures with IR thermometer, the remote structure has a higher phosphor temperature than the conformal structure. This result indicates that the phosphor in the conformal structure has demonstrated superior conduction because of the high thermal conductivity in surrounding. Furthermore, thermal distribution in the simulation results has shown to have favorable agreement with the experimental results. Consequently, the lifetime measurement is shown to verify the results of the simulation and experiment for both structural types.

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Section: Resultsmentioning

confidence: 99%

Effect of the Thermal Characteristics of Phosphor for the Conformal and Remote Structures in White Light-Emitting Diodes

et al. 2013

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“…Adding PMMA into the Green B and QDs can provide a good host material to hold these molecules or nanoparticles more evenly. On the other hand, PMMA was useful for the Green B and QDs dispensing because of the low solidifying temperature [39], [40]. Third, dispense the polymer/QD embedded suspension slurries into the LED package to fill the remaining space.…”

Section: Methodsmentioning

confidence: 99%

Excellent Color Quality of White-Light-Emitting Diodes by Embedding Quantum Dots in Polymers Material

Lin

Wang

Lin

et al. 2016

IEEE J. Select. Topics Quantum Electron.

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This study employs the polyfluorene composite (called Green B) with several colors of quantum dots to generate the highcolor-rendering index (CRI) white LEDs. The Green B polymer is a good candidate to manufacture the hybrid w-LED because of its good quantum efficacy. The hybrid w-LEDs are fabricated by the mixing of Green B with yellow quantum dots and red quantum dots or orange quantum dots to obtain the correlated color temperatures of 3500 and 5500 K. The use of the hybrid polymer/QDs w-LEDs is proved to be beneficial as QD w-LEDs can improve the CRI up to 90 in 3500 K. The luminous efficiency of such devices can be as high as 17.2l m/W. Index Terms-Light-emitting diodes (LEDs), quantum dots (QDs).

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“…QDs exhibit prominent properties such as good photostability, high luminescence efficiency and facile color tunability by the quantum confinement effect and low-cost solution process ability [2,3,5,8,[10][11][12][13][14][15][16]. Quantum dots may be categorized by their synthetic routes as either ‗colloidal' or ‗epitaxial' (also known as ‗self-assembled').…”

Section: Introductionmentioning

confidence: 99%

High-Performance Solution Processed Inorganic Quantum-Dot LEDs

Amini

Dolatyari

Rostami

et al. 2015

IEEE Trans. Nanotechnology

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In this research paper, fabrication of novel CdSe\ZnS QD-LEDs with solution processing method is presented and the impact of trap energy levels in the electron and hole transport levels on these QD-LEDs brightness is investigated. Two types of QD-LEDs are fabricated with ITO as the transparent anode electrode, NiO nanoparticles as the hole transport layer (HTL), CdSe\ZnS QDs as the luminescent layer, ZnO: Ga as the electron transport layer (ETL), and Al as the cathode electrode. The NiO nanoparticles are synthesized by solgel or alternatively electrochemical method. Formation of different trap levels is observed in the crystal structures of the NiO nanoparticles synthesized by each of these methods. Considering the electrochemically prepared NiO nanoparticles, it is found that the density of trap levels is higher in the crystal structure of the NiO nanoparticles synthesized by sol-gel method and the device fabricated by the later material shows higher performance. Calculation of the electronic structure of ZnO: Ga by DFT methods (GGA-PBE) indicates that doping of Ga in the structure of crystalline ZnO creates new energy levels in conduction band and intermediate bands at the band gap of ZnO host. It facilitates electron injection from Al cathode to the ZnO:Ga ETL layer and from this layer to the QD luminescent layer. The fabricated devices show turn-on lower voltages than 5V in which a peak brightness of 500cdm -2 and 340cd m -2 is measured for the LEDs fabricated with sol-gel and electrochemically synthesized NiO nanoparticles respectively.Index Terms-Light emitting diode, Quantum dot, NiO, ZnO: Ga, Photo luminescence 1536-125X (c)

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The Influence of the Thermal Effect on CdSe/ZnS Quantum Dots in Light-Emitting Diodes

Cited by 62 publications

References 33 publications

Effect of the Thermal Characteristics of Phosphor for the Conformal and Remote Structures in White Light-Emitting Diodes

Effect of the Thermal Characteristics of Phosphor for the Conformal and Remote Structures in White Light-Emitting Diodes

Excellent Color Quality of White-Light-Emitting Diodes by Embedding Quantum Dots in Polymers Material

High-Performance Solution Processed Inorganic Quantum-Dot LEDs

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