Bright high-colour-purity deep-blue carbon dot light-emitting diodes via efficient edge amination

Yuan, Fanglong; Wang, Ya-Kun; Sharma, Geetu; Dong, Yitong; Zheng, Xiaopeng; Li, Peicheng; Johnston, Andrew; Bappi, Golam; Fan, James; Kung, Hao Ting; Chen, Bin; Saidaminov, Makhsud I.; Singh, Kulbir; Voznyy, Oleksandr; Bakr, Osman M.; Lu, Zheng‐Hong; Sargent, Edward H.

doi:10.1038/s41566-019-0557-5

Cited by 344 publications

(314 citation statements)

References 43 publications

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“…Meanwhile, due to the Stokes shift, the optical efficiency decreases in each cycle of reabsorption. In some of the C-dots reported in the literature, they have a relatively large Stokes shift (200 to 840 meV), 74,96,103,104,118 which is comparable to the large Stokes shift reported for inorganic QDs. 39,40,51,53,120,121 UV C-dots have a large Stokes shift of 275-840 meV (Table 2).…”

Section: Stokes Shift In C-dotssupporting

confidence: 62%

“…30 The current obtained C-dots have very unique optical properties, including size tunable absorption/ emission spectra covering from 300 to 1000 nm, structure and surface dependent Stokes shift, high QY up to 99% and very good colloidal-, thermal-and photo-stability, which open a new avenue as building blocks for LSC fabrication. 74,[103][104][105][106][107]…”

Section: Exciton Dynamics and Optical Properties Of C-dotsmentioning

confidence: 99%

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Earth abundant colloidal carbon quantum dots for luminescent solar concentrators

et al. 2020

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Section: Stokes Shift In C-dotssupporting

confidence: 62%

Section: Exciton Dynamics and Optical Properties Of C-dotsmentioning

confidence: 99%

Earth abundant colloidal carbon quantum dots for luminescent solar concentrators

et al. 2020

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“…This result is consistent with the result reported by Yuan. [ 31,40 ] All can be explained by the Varshni equation. [ 10,11,41,42 ] However, many peaks originating from shallow energy level that emerge in PL spectra under 325 nm fs pulsed laser cannot be excited by xenon lamp.…”

Section: Resultsmentioning

confidence: 99%

“…Also, the rest of energy levels functional layers were acquired in the recent papers reported. [ 31,40,44 ] From the basement of ITO, the conduction/valence band is suitable enough for high‐efficiency electron injection in the PEDOT:PSS/CDots:PVK interface. From the top of aluminum electrode, holes will easily transfer to the HTL through the Liq/TPBi interface and then be injected into the TPBi/CDots:PVK interfaces with extremely small resistance due to the excellent hole movement of TPBi.…”

Section: Resultsmentioning

confidence: 99%

A Bright and Stable Violet Carbon Dot Light‐Emitting Diode

Wang

Zhang

et al. 2020

Advanced Optical Materials

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Violet light‐emitting diodes (LEDs) with emission at 400 nm are very important for solid‐state lighting, high‐density information storage, display technology, and biology medical treatment. Wide band‐gap semiconductors and/or the semiconductor quantum dots (QDs), typically based on heavy metals such as cadmium and lead, are promising candidates for the violet LEDs, but so far these have had external quantum efficiencies (EQEs) lower than 0.31% (luminance 147.6 cd cm−2; 410 nm). Herein, violet light‐emitting materials and the violet LED devices based on carbon dots (CDots) are presented. The CDots have absolute photoluminescence quantum yield of 23.9% and produce two‐narrow‐peak emission at 382 and 401 nm with narrow full‐width at half‐maximum about 30 nm, respectively. The violet LEDs based on these CDots display high performance with a maximum luminance of 163 cd m−2 (electroluminescence peak located at 408 nm; Commission International de I'Eclairage color coordinate (0.180, 0.121)) and high EQE of 0.831%, exceeding that of previously reported semiconductor QDs‐based violet LEDs. Moreover, these CDots‐based violet LEDs have a high current efficiency of 0.62 cd A−1, a long lifetime (T50, 50 h), as well as a low turn‐on voltage of 3.7 V.

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“…Since its rst discovery in 2006 25 , carbon dots (CDs), an emerging class of luminescent nanomaterials, have drawn massive research interest for their fascinating PL properties, advanced stability and low-toxicity nature. Based on that, the vast applications of CDs in different elds, including bio-imaging, theranostics, illumination/display, and energy conversion have been explored [26][27][28][29] . Particularly, CDs materials with room temperature long afterglow have recently become a new research hotspot 30-40 , showing superiority in applications compared to the traditional uorescent CDs.…”

Section: Introductionmentioning

confidence: 99%

Photo-induced Afterglow of Carbon Dots for Dynamic Patterning

Liu¹,

Huang²,

Niu³

et al. 2020

Preprint

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Flexible materials with afterglow feature have received considerable attention in the field of flexible electronics. To date, it is still a formidable challenge to develop flexible materials with dynamic long afterglow for practical applications. Herein, we report for the first time photo-induced long afterglow in a flexible solid composite film made of luminescent carbon dots (CDs) and the oxygen-permeable poly pyrrolidone (PVP). The phosphorescent afterglow of the film can be reversibly activated by photo-irradiation and de-activated by thermal treatment. Impressively, the photo-activation leads to a significant luminescence lifetime enhancement with a factor of over 3900, and editable afterglow patterns with fine resolution exceeding 1280 dpi are readily achieved by masking and lithography. Furthermore, the retention time of such memorized optical patterns can be tuned from minutes to days by varying temperature, enabling the unique time-temperature indicating function. These findings not only enrich both the library of the afterglow materials vastly, but also extend the scope of the potiential applications of CDs materials.

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Bright high-colour-purity deep-blue carbon dot light-emitting diodes via efficient edge amination

Cited by 344 publications

References 43 publications

Earth abundant colloidal carbon quantum dots for luminescent solar concentrators

Earth abundant colloidal carbon quantum dots for luminescent solar concentrators

A Bright and Stable Violet Carbon Dot Light‐Emitting Diode

Photo-induced Afterglow of Carbon Dots for Dynamic Patterning

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