Patterned Removal of Molecular Organic Films by Diffusion

Packard, Corinne E.; Aidala, Katherine; Ramanan, S.M. Shanmuga; Bulović, Vladimir

doi:10.1021/la2016929

Cited by 11 publications

(11 citation statements)

References 16 publications

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“…The driving force of this diffusion process is the concentration difference. In the case of rubbery polymers, such as PDMS used in this study, several studies have reported the spontaneous diffusion of small molecules even in fully cured PDMS films because of free volume holes induced by imperfect cross‐linking . The low glass transition temperature of PDMS (−123 °C) can also promote a chain movement for easier molecular diffusion .…”

Section: Resultsmentioning

confidence: 93%

Mechanoluminescence Color Conversion by Spontaneous Fluorescent‐Dye‐Diffusion in Elastomeric Zinc Sulfide Composite

Jeong

Song

Kim

et al. 2016

Adv Funct Materials

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wileyonlinelibrary.comtechnologies because ML can be generated by all mechanical vibrations occurring in nature. [ 3 ] Elastico-ML, luminescence by elastic deformation, has been mainly used for advanced applications because of its potential durability. [ 4,5 ] Various approaches have been proposed for using ML in sensor applications, mainly for visualizing crack propagation and for stress distribution. [5][6][7][8][9][10] Recently, the polydimethylsiloxane (PDMS)-supported zinc sulfi de (ZnS) composite structure has received considerable attention [ 3,[11][12][13][14][15][16][17] because of its durable [ 15,16 ] and color-tunable [ 3,17 ] ML characteristics. Such PDMS composites are very attractive owing to their easy fabrication, mechanical robustness, and low cost. Notably, from the viewpoint of application, the various color expression technologies could broaden the MLapplication fi elds. To date, many papers have been published reporting various inorganic compounds with color of ultraviolet, [ 18 ] blue, [ 19,20 ] green, [ 21,22 ] orange, [ 23 ] and red. [24][25][26] Alternative methods for ML color-tuning have also been proposed; the tuning characteristics were obtained by mixing different colored ML particles [ 17 ] or by changing the dopant concentration. [ 27 ] However, the strategies of previous reports have focused on color-tuning of ML material itself through newly developed inorganic ML compounds. In this paper, we introduce a new strategy for the color manipulation of ML by fl uorescent dyes physically combined with existing ML materials.Color conversion using wavelength-converter materials has been widely applied in light-emitting devices such as organic/ inorganic light-emitting diodes [28][29][30] and dye lasers. [31][32][33] Several types of wavelength-converter materials are available, such as phosphors, semiconductors, and dyes. [ 28 ] In particular, organic fl uorescent dyes are promising for the development of low-temperature solution-processed devices because organic dyes are usually soluble in various solvents. Hence, if energy-transferrable organic fl uorescent dyes with different luminescence and absorption spectra can be combined with ML materials, broad-color manipulation technology would be promoted because various emission colors can be produced depending on the dyes selected.Color conversion, long-wavelength light emission by absorbing shortwavelength light, is an attractive approach for developing a broad-color expression technology and is widely used in solid-state lighting, dye-lasers, and colorful displays. Up to now, many papers have been published reporting various mechanoluminescent materials emitting color of ultraviolet, blue, green, orange, and red. However, the strategies of previous reports have focused on color-tuning of mechanoluminescent material itself through newly developing inorganic mechanoluminescent compounds. Here, a new strategy for the color manipulation of mechanoluminescence (ML) is introduced by physically combining fl uorescent dyes with existing mechanol...

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Section: Resultsmentioning

confidence: 93%

Mechanoluminescence Color Conversion by Spontaneous Fluorescent‐Dye‐Diffusion in Elastomeric Zinc Sulfide Composite

Jeong

Song

Kim

et al. 2016

Adv Funct Materials

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“…On the other hand, thicker crystals (≈500 nm) on PDMS took longer than 3 h for complete diffusion (Figure S2, Supporting Information). Several studies have reported that PDMS can contain free volume holes induced by imperfect crosslinking . These results led us to expect that PTZ would be able to penetrate PDMS.…”

Section: Resultsmentioning

confidence: 97%

Single‐Component‐Based White Light Photoluminescence Emission via Selective Photooxidation in an Organic–Polymer Hybrid System

Lee

Song

Hong

et al. 2017

Adv Funct Materials

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White light-emitting phenothiazine-poly(dimethylsiloxane) (PTZ-PDMS) composites are formed by a photooxidation reaction. The oxidized PTZ species, i.e., PTZ cation radicals and dication species, are created by electron transfer from the PTZ molecules to PDMS under UV irradiation. In situ UVvis and electron spin resonance (ESR) spectroscopies are carried out after UV exposure of PTZ-PDMS, and the results provide evidence for the spontaneous ionization of PTZ. The spectral changes indicate the formation of PTZ •+ (radical cation) and PTZ 2+ (dication) within the PDMS matrix. Moreover, a combination of PTZ, PTZ •+ , and PTZ 2+ , together with the PDMS matrix, show an unexpected emission of white light with Commission Internationale de L'Eclairage coordinates of 0.34 and 0.32, which are close to those of pure white light. These findings potentially offer a new route and strategy for the development of flexible white light-emitting materials.

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“…Transfer of the QD layer to the OSC film upon separation of the stamp and substrate is presumed to proceed due to stronger energetic interactions between the QD ligands and the OSC film compared to the surface of the stamp. The (non-optimal) use of uncoated PDMS stamps can present an additional complication, as it has been demonstrated that bare PDMS can remove a portion – or the entirety – of the OSC film upon contact printing (39, 40). …”

Section: Contact Printing Of Colloidal Qd Filmsmentioning

confidence: 99%

Contact printing of colloidal nanocrystal thin films for hybrid organic/quantum dot optoelectronic devices

2012

Self Cite

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Novel thin film optoelectronic devices containing both inorganic colloidal semiconductor quantum dots (QDs) and organic semiconductor thin films have been widely investigated in recent years for a variety of applications. Here, we review one of the most versatile and successful methods developed to integrate these two dissimilar material classes into a functional multilayered device: contact printing of colloidal QD films. Experimental details regarding the contact printing process are outlined, and the key advantages of this QD deposition method over other commonly encountered techniques are discussed. The use of tapping mode atomic force microscopy (AFM) to effectively characterize QD film morphology both on an elastomeric stamp (before contact printing) and as-transferred to the organic semiconductor receiving film (after contact printing) is also described. Finally, we offer suggestions for future efforts directed toward the goal of rapid, continuous QD deposition over larger substrates for the advancement of hybrid optoelectronic thin film devices.

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Patterned Removal of Molecular Organic Films by Diffusion

Cited by 11 publications

References 16 publications

Mechanoluminescence Color Conversion by Spontaneous Fluorescent‐Dye‐Diffusion in Elastomeric Zinc Sulfide Composite

Mechanoluminescence Color Conversion by Spontaneous Fluorescent‐Dye‐Diffusion in Elastomeric Zinc Sulfide Composite

Single‐Component‐Based White Light Photoluminescence Emission via Selective Photooxidation in an Organic–Polymer Hybrid System

Contact printing of colloidal nanocrystal thin films for hybrid organic/quantum dot optoelectronic devices

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