Order-of-Magnitude, Broadband-Enhanced Light Emission from Quantum Dots Assembled in Multiscale Phase-Separated Block Copolymers

Kim, Geon Yeong; Kim, Shinho; Choi, Jung Chan; Kim, Moo-Hyun; Lim, Hunhee; Nam, Tae Won; Choi, Wonseok; Cho, Eugene N.; Han, Hyeuk Jin; Lee, ChulHee; Kim, Jong Chan; Jeong, Hu Young; Choi, Sung‐Yool; Jang, Min Seok; Jeon, Duk Young; Jung, Yeon Sik

doi:10.1021/acs.nanolett.9b01941

Cited by 25 publications

(22 citation statements)

References 43 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…These microstructures can be built by the self‐assembly of materials or by artificial construction. [ 44,45,65 ] Kim et al. suggested a QD‐block copolymer (BCP) composite film through the assembly of QDs and poly(styrene‐b‐4‐vinylpyridine)) (PS‐b‐P4VP) BCP as shown in Figure .…”

Section: Luminescence Enhancementmentioning

confidence: 99%

“…suggested a QD‐block copolymer (BCP) composite film through the assembly of QDs and poly(styrene‐b‐4‐vinylpyridine)) (PS‐b‐P4VP) BCP as shown in Figure . [ 65 ] Under controlled humidity conditions, the casted BCP matrix provides multiscale phase‐separation features: sub‐µm‐scale spinodal decomposition between polymer‐rich and water‐rich phases, and sub‐10‐nm‐scale microphase separation between polymer blocks. The bi‐continuous pores induced random light scattering, which effectively enhanced the light absorption and extraction efficiency.…”

Section: Luminescence Enhancementmentioning

confidence: 99%

See 1 more Smart Citation

Luminescence Enhancement, Encapsulation, and Patterning of Quantum Dots Toward Display Applications

Saeed

Zhang

et al. 2021

Adv Funct Materials

View full text Add to dashboard Cite

Quantum dots (QDs) are semiconductor nanoparticles (NPs) that have gained significant interest in the academia and industry because of their unique optoelectronic properties such as tunable emission wavelength, high color purity, wide color gamut, and high photoluminescence quantum yield. However, it remains a challenge to fabricate a QD colloid or solution into solid devices featuring the desired patterns and maintaining high efficiency. Recently, researchers have shown significant progress in the efficiency improvement and device fabrication of QD-based displays, contributed by the development of both materials and device engineering. In this review, the recent progress in the engineering of QDs will be discussed, with an emphasis on the encapsulation methods and patterning strategies by which QDs are packaged into solid-state devices with pixelated patterns as well as luminescence enhancement and modulation.

show abstract

Section: Luminescence Enhancementmentioning

confidence: 99%

Section: Luminescence Enhancementmentioning

confidence: 99%

Luminescence Enhancement, Encapsulation, and Patterning of Quantum Dots Toward Display Applications

Saeed

Zhang

et al. 2021

Adv Funct Materials

View full text Add to dashboard Cite

show abstract

“…[ 4 ] However, TiO 2 nanoparticles feature parasitic absorption in the UV light range and might induce potential risk for human health, limiting their application in some scenarios such as UV‐excited quantum dot (QD) films. [ 5,6 ] Currently, porous polymer structures without doped scattering particles are rising to replace such conventional nanoparticle composites. [ 7–9 ] Nevertheless, it is a grand challenge to make porous polymer structures with significant scattering ability due to the intrinsic low refractive index of polymers.…”

Section: Introductionmentioning

confidence: 99%

Biomimetic Porous Fluoropolymer Films with Brilliant Whiteness by Using Polymerization‐Induced Phase Separation

Huang

Fang

et al. 2021

Adv Materials Inter

View full text Add to dashboard Cite

Inspired by the Cyphochilus scale with extreme whiteness, fluoropolymer is used as the matrix to prepare highly scattering porous polymer films through polymerization‐induced phase separation (PIPS) method. The mixture used for the PIPS technique contains a fluoride monomer, a UV photoinitiator, and porogens (cyclohexanol and perfluorooctanol). By carefully tuning the mixture parameters (cyclohexanol–perfluorooctanol and monomer–porogen weight ratios), the porous morphology can be well tailored, which induces different scattering performances. With an optimized formulation (50 wt% monomer, 25 wt% cyclohexanol, and 25 wt% perfluorooctanol), the porous film with a thickness of 55 µm can achieve an average total reflectance of ≈90%, featuring a measured transport mean free path of 1.3–1.7 µm (comparable to the 1.5 µm of the benchmark Cyphochilus scale). Further, the porous films are applied to the light‐emitting diode (LED) device and it is demonstrated that they can effectively improve the light extraction efficiency of the LED and thus enhance the luminous performance. Due to the simplicity, cost‐effectiveness, and scalability of the PIPS method, the as‐developed porous fluoropolymer films with such excellent scattering ability can find many potential applications not only in the field of optoelectronics, but also in various complex scenarios, such as daytime passive radiative cooling.

show abstract

“…[ 20 ] In addition, nonsolvent‐induced phase separation was also leveraged to prepare particle‐free porous films with superior scattering ability, which largely improves the optical performance of QD films and organic LEDs. [ 3,21–24 ] Different from particle‐based diffusing membranes, particle‐free optical diffusers are made from porous structures with high integrity stemming from their continuous bulk structures. There are several superior properties in terms of such unique bulk structures.…”

Section: Introductionmentioning

confidence: 99%

High‐Transmittance and High‐Haze Composite Particle‐Free Optical Diffusers Enabled by Polymerization‐Induced Phase Separation

Liang

Huang

et al. 2021

Advanced Photonics Research

View full text Add to dashboard Cite

Optical diffusers with combined high transmittance and high haze are desired for the light management of various optoelectronic devices. However, the fabrication of such optical diffusers is still a grand challenge, limiting the wide application of optical diffusers. Herein, a technique by combining polymerization‐induced phase separation (PIPS) and postpolymer encapsulation to make composite particle‐free optical diffusers is proposed, achieving combined high transmittance and high haze. By altering the composition of two porogens, the morphology of the porous structure can be well tailored, which generates different scattering modes. Furthermore, the transmittance and haze spectra can be tuned by varying the diffuser thickness. At an optimized form, a composite optical diffuser is capable of achieving superhigh haze (88%), while maintaining a high degree of transparency (88%). Finally, the optical diffusers are applied to phosphor‐converted light‐emitting diodes for color uniformity enhancement and quantum dot films for photoluminescence intensity improvement. The present technique provides a facile, low‐cost, and easily scalable route for making optical diffusers with high transmittance and haze, which may facilitate their real‐world application.

show abstract

Order-of-Magnitude, Broadband-Enhanced Light Emission from Quantum Dots Assembled in Multiscale Phase-Separated Block Copolymers

Cited by 25 publications

References 43 publications

Luminescence Enhancement, Encapsulation, and Patterning of Quantum Dots Toward Display Applications

Luminescence Enhancement, Encapsulation, and Patterning of Quantum Dots Toward Display Applications

Biomimetic Porous Fluoropolymer Films with Brilliant Whiteness by Using Polymerization‐Induced Phase Separation

High‐Transmittance and High‐Haze Composite Particle‐Free Optical Diffusers Enabled by Polymerization‐Induced Phase Separation

Contact Info

Product

Resources

About