High luminescence efficiency white light emitting diodes based on surface functionalized quantum dots dispersed in polymer matrices

Yoon, Cheolsang; Hong, Hyun-Guk; Kim, Hyeon Chang; Hwang, Daehyun; Lee, DohChang; Kim, Chang‐Koo; Kim, Young-Joo; Lee, Kangtaek

doi:10.1016/j.colsurfa.2013.03.045

Cited by 39 publications

(16 citation statements)

References 25 publications

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“…This can be solved by tailoring the geometry of the lens or texturing the surface of the materials upon processing. v) Processing and Matrix Materials : Easy lens molding at low temperature as well as easy patterning or texturing of the surface, chemical compatibility with the phosphor, high photoresistance and thermal‐resistance with respect to the structural properties and transmittance, refractive index, etc., and good encapsulation features against moisture. So far, polymer matrices, epoxies, and silicones require a solidification process involving electrochemical cross‐linking, gamma or UV curing, and thermal curing reactions . Ideally, the matrix should be biodegradable and should cure under ambient conditions without chemical cross‐linking reactions to avoid phase separation or chemical degradation of the organic phosphors.…”

Section: Ileds Oleds and Lecs Based On Biological Materialsmentioning

confidence: 99%

Merging Biology and Solid‐State Lighting: Recent Advances in Light‐Emitting Diodes Based on Biological Materials

Fresta

Fernández-Luna

Coto

et al. 2018

Adv Funct Materials

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Solid-state lighting (SSL) is one of the biggest achievements of the 20 th century. It has completely changed our modern life with respect to general illumination (light-emitting diodes), flat devices and displays (organic lightemitting diodes), and small labeling systems (light-emitting electrochemical cells). Nowadays, it is however mandatory to make a transition toward green, sustainable, and equally performing lighting systems. In this regard, several groups have realized that the actual SSL technologies can easily and efficiently be improved by getting inspiration from how natural systems that manipulate light have been optimized over millennia. In addition, various natural and biocompatible materials with suitable properties for lighting applications have been used to replace expensive and unsustainable components of current lighting devices. Finally, SSL has also started to revolutionize the biomedical field with the achievement of efficient implantable lighting systems. Herein, the-state-of-art of (i) biological materials for lighting devices, (ii) bioinspired concepts for device designs, and (iii) implantable SSL technologies is summarized, highlighting the perspectives of these emerging fields.

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Section: Ileds Oleds and Lecs Based On Biological Materialsmentioning

confidence: 99%

Merging Biology and Solid‐State Lighting: Recent Advances in Light‐Emitting Diodes Based on Biological Materials

Fresta

Fernández-Luna

Coto

et al. 2018

Adv Funct Materials

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show abstract

“…7b). The bonding of 1-dodecanethiol molecules onto the QDs' surface can induce electrostatic or steric barriers that can compete with vdW forces or depletion interaction [32]. As a result, the aggregation changes the optical properties, with a red-shift.…”

Section: Resultsmentioning

confidence: 99%

Morphology, optical, and electric properties of polymer-quantum dots nanocomposites: effect of polymeric matrix

et al. 2016

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Polymer-CdTe quantum dots (QDs) nanocomposites were developed via solvent casting. Colloidal CdTe QDs, synthesized in aqueous solution, were transferred to organic media by exchanging of the original capping ligands by a long-chain thiol. Different commercial polymers (PMMA, OPS, PS, and PC), transparent in the visible spectral range, were chosen as matrices. Stock solutions of the polymers were prepared in suitable concentration (2 wt%) for the production of thin films with good quality, able to maximize the solubility of QDs, without phase separation. Studies on the morphological and optical properties were performed. The results showed that the polymer matrix has a considerable effect on QDs' morphology, size, and electric conductivity. PMMA demonstrated to be the most promising embedding matrix, offering new possibilities for optoelectronic applications of polymer-QD nanocomposites.

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“…On-surface green perovskite-polymer and red QD films excited by blue LEDs: Since at current stage QDs would mostly suffer from lifetime and stability decrease in "onchip" design due to high flux and high LED junction temperature (~150 °C) [27], it is better to use "on-surface" configuration. To reduce reabsorption and enhance the photoluminescence, layered structures were found to be more effective with green emitters on top of red ones [28]. Figure 2(a) shows the configuration of "back-toback" green perovskite-polymer on red QD films pumped by blue LEDs.…”

Section: Hybrid Backlight System Configurationsmentioning

confidence: 99%

Hybrid downconverters with green perovskite-polymer composite films for wide color gamut displays

Chen

Wang

et al. 2017

Opt. Express

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We propose to use a hybrid downconverter system comprising low-cost green perovskite-polymer composite films for liquid crystal display (LCD) backlight unit (BLU) to realize wide color gamut. Recently, ultrastable, highly luminescent CHNHPbBr (MAPbBr) organic-inorganic perovskite-polymer composite films have been developed. These films exhibit outstanding color quality with a full-width-at-half-maximum (FWHM) of only 18 nm and a peak wavelength of 530 nm, which makes them promising candidates as green downconverters. Two configurations to hybridize these green films with state-of-the-art red emitting downconverters, including CdSe-based quantum dots (QDs) and narrow peak phosphors, are proposed. Color and efficiency analyses indicate that the hybridization of green perovskite-polymer films with red KSiF:Mn (KSF) phosphor could lead to wide color gamut coverage of nearly 90% Rec. 2020 and high total light efficiency (TLE) of around 20 lm/W while maintaining low cost.

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High luminescence efficiency white light emitting diodes based on surface functionalized quantum dots dispersed in polymer matrices

Cited by 39 publications

References 25 publications

Merging Biology and Solid‐State Lighting: Recent Advances in Light‐Emitting Diodes Based on Biological Materials

Merging Biology and Solid‐State Lighting: Recent Advances in Light‐Emitting Diodes Based on Biological Materials

Morphology, optical, and electric properties of polymer-quantum dots nanocomposites: effect of polymeric matrix

Hybrid downconverters with green perovskite-polymer composite films for wide color gamut displays

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