Light diffusing, down-converting perovskite-on-polymer microspheres

Caicai, Zhang; He, Ziqian; Chen, Hao; Zhou, Le; Tan, Guanjun; Wu, Shin‐Tson; Dong, Yajie

doi:10.1039/c9tc01130g

Cited by 18 publications

(15 citation statements)

References 47 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Often their instability is attributed to their low formation energy, highly dynamic binding in solution, and susceptibility to heat, moisture, oxygen, and light. To fulfill the request for narrow‐band, color‐tunable, low‐cost, and stable downconverters, our group recently developed light‐diffusing perovskite‐polymer composites consisting of PNCs and polymer microspheres 11 …”

Section: Enter Light‐diffusing Perovskite‐polymer Compositesmentioning

confidence: 99%

Tailoring the Spectrum: Low‐Cost Perovskite‐Polymer Composites

He¹,

Zhang²,

Dong³

et al. 2020

Information Display

Self Cite

View full text Add to dashboard Cite

As solid-state lighting becomes smarter and strives for more than saving energy, the ability to tailor the spectrum following specific requirements offers tremendous opportunities. Here, four authors from the University of Central Florida propose low-cost, lightdiffusing perovskite-polymer composites to meet demand.WITH ITS LOWER POWER CONSUMPTION, LONGER LIFEtime, smaller size, higher brightness, and faster response time, solid-state lighting (SSL) based on white LEDs has gradually overtaken incandescent and fluorescent lighting sources in the last few decades.1 Although researchers have devoted significant effort to improving its efficiency, they've also studied the biological impact of light on human beings, plants, and animals.2,3 Now is the time for SSL manufacturers to aim beyond energy savings, and expand their focus to applications such as circadian or horticultural lighting. In that sense, tailoring the spectrum according to specific requirements will become increasingly crucial, as it will maximize the effectiveness of the lighting by ensuring the presence of necessary spectrum components and, in the meantime, reduce or omit unnecessary or even damaging portions of the spectrum. For instance, under ambient light, the intrinsically photosensitive retinal ganglion cells (ipRGCs) innervating the suprachiasmatic nucleus (SCN) can influence melatonin secretion, thereby affecting the circadian rhythm.4 In reference to the experiments on light-induced melatonin suppression, Dietrich Gall proposed an "action spectrum" of the circadian effect, with a peak at blue wavelengths.5 (Incidentally, an "action spectrum" means a response spectrum correlated to the circadian effect, in this case with a peak around 460 nanometers [nm].) Indeed, it is necessary to factor the circadian effect into future design considerations to achieve human circadian lighting.With this in mind, here we examine current SSL solutions and, based on the tailored SSL requirements, we propose low-cost, light-diffusing perovskite-polymer composites as candidates for narrow-band, color-tunable emitters. Using spectral optimizations, we offer a circadian SSL solution with high efficiency and excellent color rendering by incorporating perovskite-polymer composites. What SSL Currently OffersCurrent SSL solutions can be roughly categorized into three classes. Phosphor-converted white LEDs (pc-WLEDs) are the first and most mainstream solution. The simple design and low cost make them ideal for general, static lighting. However, the phosphor's broad spectral power distribution (SPD) is considered spectrally inefficient, because human eyes are most sensitive to green light with a peak at 555 nm (photopic vision), and the broad SPD causes a significant spillover of light into the deeper red where human vision is not very sensitive. Meanwhile, as SSL becomes smarter, it requires SPD dynamic tuning. 6,7 Although some existing proposals can tune the SPD of pc-WLEDs (by using, for example, an active color filter), 8,9 it is still energy-inefficient, with a ra...

show abstract

Section: Enter Light‐diffusing Perovskite‐polymer Compositesmentioning

confidence: 99%

Tailoring the Spectrum: Low‐Cost Perovskite‐Polymer Composites

He¹,

Zhang²,

Dong³

et al. 2020

Information Display

Self Cite

View full text Add to dashboard Cite

show abstract

“…To overcome these issues, our group recently developed a onestep synthesis method of polymer beads based PPCs (Figure 4a). [41] By fully mixing perovskite precursors (CsPbBr3), ligands (oleylamine and oleic acid) and polymer beads (PS or PMMA), the luminescent PPCs can be quickly and easily generated The optical images of printed PNC patterns on different polymer substrate under UV light. Reproduced by permission of John Wiley and Sons, Copyright 2019.…”

Section: Polymer Beads Based Sdmmentioning

confidence: 99%

“…(b) Images of PPCs with different anion compositions under ambient light (upper)and 365 nm UV light (lower) illumination. Reproduced by permission of The Royal Society of Chemistry [41].…”

mentioning

confidence: 99%

Swelling‐Deswelling Microencapsulation‐Enabled Ultrastable Perovskite−Polymer Composites for Photonic Applications

Zhang

et al. 2019

The Chemical Record

Self Cite

View full text Add to dashboard Cite

show abstract

“…20 The amphiphilic polymer poly-(isobutylene-alt-maleic anhydride)-graf t-dodecyl was used to prevent moisture or water degradation by protecting the polymeric matrix. 21 A technique such as electrospinning was also reported to convert nanofibers into light-emitting devices for flexible or wearable electronic products. 22 A new strategy of core/shell perovskite preparation has been investigated recently.…”

Section: ■ Introductionmentioning

confidence: 99%

“…New approaches showed the high stability of the perovskite NCs while simultaneously keeping the PL properties, such as amphiphilic star-like diblock copolymers, polymer organogel-containing organic–inorganic LHP NCs, and encapsulation of CsPbBr 3 quantum dots in molecularly imprinted polymer layers using a sol–gel process . The amphiphilic polymer poly-(isobutylene- alt -maleic anhydride)- graft -dodecyl was used to prevent moisture or water degradation by protecting the polymeric matrix . A technique such as electrospinning was also reported to convert nanofibers into light-emitting devices for flexible or wearable electronic products .…”

Section: Introductionmentioning

confidence: 99%

Highly Water-Stable Polymer–Perovskite Nanocomposites

Carrizo

Belmonte

Santos

et al. 2021

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

The excellent performance of hybrid metal-halide perovskite nanocrystals (NCs) contrasts with their unsatisfactory stability in a high-humidity environment or water. Herein, polymer composite lead-halide perovskites (LHPs) NCs were prepared by casting or spin-coating to produce a high fluorescence yield and a fully water-resistant material. Poly(L-lactide) (PLla), polypropylene glycol (PPGly), and polysulfone (PSU) commercial polymers were used to prepare suspensions of MAPbBr 3 −HDA NCs (MA: CH 3 NH 3 ; HDA: hexadecylamine). The MAPbBr 3 −HDA@PLla suspension exhibited a maximum fluorescence quantum yield of 93% compared to 43% for the pristine MAPbBr 3 −HDA NCs. Strong emissions around 528 nm were also observed, with the same full width at half maximum value of 20 nm, demonstrating the successful fabrication of brightly luminescent LHP NCs@polymer combinations. Time-resolved photoluminescence measurements directly observed the enhanced spontaneous emission of the NCs induced by the polymeric environment. However, the cast films of MAPbBr 3 −HDA NCs mixed with PLla or PPGly did not resist water immersion. On the contrary, MAPbBr 3 −HDA@PPGly/PSU films containing well-dispersed ∼10 nm LHP NCs retained a bright green fluorescence emission even after 18 months under air conditions or water immersion up to 45 °C. From water contact angle measurements, profilometry, and X-ray photoelectron spectroscopy data, it could be assumed that the slightly hydrophobic PSU polymer is responsible for the high water stability of the fluorescent films, which avoids MAPbBr 3 −HDA NC degradation. This work shows that the LHP NC dispersion in dissolved commodity polymers holds great promise toward the long-term stability of LHP NC composites for the future development of wearable electronic devices and other waterproof applications.

show abstract

Light diffusing, down-converting perovskite-on-polymer microspheres

Cited by 18 publications

References 47 publications

Tailoring the Spectrum: Low‐Cost Perovskite‐Polymer Composites

Tailoring the Spectrum: Low‐Cost Perovskite‐Polymer Composites

Swelling‐Deswelling Microencapsulation‐Enabled Ultrastable Perovskite−Polymer Composites for Photonic Applications

Highly Water-Stable Polymer–Perovskite Nanocomposites

Contact Info

Product

Resources

About