Letian Dou @ Purdue

Chemist, Chemical Engineer, Material Scientist, Device Engineer.
Paul & Phyllis Fireman Professor of Chemistry at Emory University

[Letian Dou @ Purdue @DouLetian]

A great story about our recent work on novel ionic liquid additive for stable perovskite solar cell.

[TechXplore @TechXplore_com]

##IonicLiquids significantly enhance #Perovskite solar cell stability, enabling devices to retain 90% performance after 1,500 hours at 90°C under continuous sunlight. @NatureEnergyJnl https://t.co/3bm6Ew2ntn https://t.co/iUT8Ybuxx4

[Letian Dou @ Purdue @DouLetian]

RP phase and DJ phase layered halide perovskite mateirals have been widely studied. In this work, together with @ProfSavoie we introduce "BD" phase, which could be more stable and more tunable! Congratulations to Dr. Chenjian Lin and the team.

[Chenjian Lin @LCJJJJ]

Our latest work in @DouLetian lab just published! @NatureChemistry We synthesized and obtained single crystal of intralayer bidentate "B-D" phase 2D perovskites which show superior stability in films and devices!
https://t.co/aqzN5cWobZ

[J. Am. Chem. Soc. @J_A_C_S]

Modulation of the Electronic and Vibrational Landscape in Lead Organic Chalcogenides | Journal of the American Chemical Society @DouLetian
@PurdueChemE
@PurdueChemistry
@PurdueEngineers
@PurdueScience https://t.co/PPcKmNZk1F

[Letian Dou @ Purdue @DouLetian]

Congratulations again and good luck with your future endeavors!

[Wenhao Shao @whshao]

I'm excited to announce my new role as Assistant Professor in the Dept. of Chem @universityofga! Huge THANK YOU♥️to my Ph.D. advisor, Dr. Jinsang Kim, postdoc advisor @DouLetian, and friends @UGAChemistry
P.S. To honor UGA's mascot, my 🐶 is in the profile https://t.co/VKc8edLsYZ

[Letian Dou @ Purdue @DouLetian]

And here is a story from Purdue News summarizing our recent efforts on recyclable polymers with weak C-C bonds:
https://t.co/uugyBuFrhb
@PurdueChemE @PurdueChemistry @PurdueEngineers @PurdueScience

[Letian Dou @ Purdue @DouLetian]

Excited to share our recent work with @ProfSavoie in @NatureChemistry reporting a controllable "photo-melt-bulk polymerization (PMBP)" of sustainable diene derivatives w/o initiator, catalyst, and even solvent!
Congratulations to Pengfei and the team.
https://t.co/6fWqCRgFHx

[Letian Dou @ Purdue @DouLetian]

New theoretical understanding of the carbon-carbon bond, depolymerization, and degradation of butadiene derivatives by my close collaborator and friend @ProfSavoie !

[Brett Savoie @ProfSavoie]

In theory, every polymer returns to monomer above its ceiling temperature. But for the bulk of plastic waste streams, simple “heat it up” strategies for recovering monomer are defeated by competitive thermal degradation.

For the past few years we’ve been working with the @DouLetian group to see if we could tune the ceiling temperatures of polybutadienes, a versatile and potentially very inexpensive class of polymers, down to a useful range. We’ve now comprehensively studied several design strategies—radical delocalization, lone-pair donation, hyperconjugation, steric substitution—and discovered an embarrassment of riches. It turns out to be relatively easy to suppress the ceiling temperature so that monomer recovery is possible without resorting to bulky or complex substitutions that would limit molecular weights or scalability. Perhaps more surprisingly, several simple all-carbon designs are predicted to be controllably depolymerizable, including an experimental demonstration of quantitative monomer recovery from the remarkably simple 2,5-dimethyl-2,4-hexadiene repeat unit. This work was led by the phenomenal Bumjoon Seo (now faculty at Seoultech) with experiment led by Qixuan Hu (now at Dow).

https://t.co/P6IYdGmDLR

[Letian Dou @ Purdue @DouLetian]

Excited to share recent work on the large scale synthesis and economical analysis of muconate-based depolymerizable polydienes in @NatChemEng with @ProfSavoie and Gregg Beckham from NREL. Thanks @tjdursch Also see perspectives by Haritz Sardon from UPV/EHU https://t.co/hMPxMUWCDi

[Letian Dou @ Purdue @DouLetian]

Our brief review and opinion on the recycling of polydienes, together with @ProfSavoie and his team. Some exciting results from our labs will be shared soon!

[J. Am. Chem. Soc. @J_A_C_S]

Toward Sustainable Polydienes | Journal of the American Chemical Society @LifeAtPurdue @NDscience @NotreDame @ProfSavoie @DouLetian
https://t.co/PymW5NcCvr

[Letian Dou @ Purdue @DouLetian]

And another work on perovskite epitaxial heterostructures led by Prof Enzheng Shi and his team at Westlake Univ. @EnzhengS

[Nature Synthesis @NatureSynthesis]

Now online:

Article by Jichen Dong, @DouLetian, @EnzhengS & co-workers @Westlake_Uni @PurdueChemE

Kinetic Wulff-shaped heteroepitaxy of phase-pure 2D perovskite heterostructures with deterministic slab thickness

https://t.co/hv3iw9VvfK ($)

[Letian Dou @ Purdue @DouLetian]

Happy New Year! Happy to share our recent work on NIR perovskite LED with exceptionally high efficiency and brightness due to enhanced light out-coupling and reduced defect density. Led by Sung-Doo Baek and @whshao

[Nature Communications @NatureComms]

.@DouLetian et al. from @LifeAtPurdue report a discrete island–convex dome morphology in #perovskite by solvent engineering. 2D/3D #heterostructures enable the NIR LED efficiency of 31.4% with a peak radiance of 929 W sr-1 m-2. #PeLEDs #GettingApplied https://t.co/cZTntuhErB

[Jianguo Mei @ Purdue @Jianguo_Mei]

The 9th Norte Dame - Purdue Symposium on Soft Matter and Polymers will be held on October 5th. Free registration, free foods, free drinks and free knowledge exchanges! ⁦@LifeAtPurdue⁩ ⁦@WebberLab⁩ ⁦@Yichun_Wang_Lab⁩ https://t.co/flzLR09A5H

[Letian Dou @ Purdue @DouLetian]

Thousands of organic molecules have been designed to improve perovskites, but little efforts were made the other way. Now in @Nature we show "single-molecular-like-aggregate behavior" of the organic emitter in 2D OSiP. @ProfSavoie
https://t.co/EhSgjO6xp2
https://t.co/W02qP9lBfy

[Letian Dou @ Purdue @DouLetian]

Thanks @TisdaleWA for the nice News & Views article about our perovskite moire work! https://t.co/EdX7HnnOwk
And, thanks @NatureMaterials for selecting our image as the cover for the September Issue!

[Letian Dou @ Purdue @DouLetian]

Halide perovskite moiré is now available! Great collaboration with @HuangLabPurdue and many others. Congratulations to Shuchen (now professor at USTC), Linrui, Yuan, and the team! Thanks @doescience and @PurdueChemE for the support!

[Nature Materials @NatureMaterials]

The emergence of moiré superlattices in twisted two-dimensional halide perovskites has been reported, revealing the emergence of localized bright excitons with enhanced emissions and trapped charge carriers. @HuangLabPurdue @DouLetian @Research_Purdue

https://t.co/aUeqy8AhAx

[Chenjian Lin @LCJJJJ]

Glad to see our perspective paper online! We hope the perspectives we provided can guide the future research of 2D OSiPs and relative optoelectronic devices! My first paper at @LifeAtPurdue @PurdueChemE with @DouLetian !

[Letian Dou @ Purdue @DouLetian]

And a memorable trip to TU/e hosted by profs. Rene Janssen and Shuxia Tao, followed by Next Gen PV conf @maloima @ProtesescuGroup. Happy to reconnect with the inventor of PCBM - prof. Kees Hummelen! Now heading to Cologne to conclude my sabbatical stay and ready to go home!

[Letian Dou @ Purdue @DouLetian]

Had a fruitful visit to the fantastic ipv at Univ. Stuttgart led by @miliba01 ! Thanks for the hospitality and the inspiring discussions!

[SalibaLab @SalibaLab]

We are pleased to have Prof. Letian Dou @DouLetian from @LifeAtPurdue highlighting the importance of #Dimensionality_engineering in understanding the #halide_migration in #PSCs⚡💡

[Michael Saliba @miliba01]

Fantastic #PVMaterials conference in beautiful Groningen @ZernikeInst. Here are some impressions @GiuliaGrancini @MMoralesMasis @m3lab_ @DouLetian @PetrozzaGroup @Nicogaspa @SalibaLab.

Thanks for inviting and organizing @maloima @ProtesescuGroup.

[Letian Dou @ Purdue @DouLetian]

It has been an exciting 7 years together. Good luck with your future endeavors! Congratulations again!

[Brett Savoie @ProfSavoie]

I’m excited to announce to that I’m moving my research group to the University of Notre Dame. I have accepted the positions of Coyle Mission Collegiate Professor of Engineering in @NDCBE and leader of the newly founded AI in Science and Engineering initiative.