Results 71 to 80 of about 4,019 (241)

Donor−Acceptor 9-Uncapped Fluorenes and Fluorenones as Stable Blue Light Emitters^,

, 2016
The “green emission defect” (GED) produced by fluorenones has significantly retarded the commercial scope of fluorene-based B-OLEDs. In this paper, for the first time, it is demonstrated that the “green light” emitting fluorenones 7 can be converted to ...
Vijay Kumar (377076), Bijayalaxmi Jena (2332774), Sattey Prakash (2168620), Jai K. Verma (2385838), S. Sundar Manoharan (2385829), Atul Goel (836608), Sumit Chaurasia (1515829), Manish Dixit (2385832), Mayank Jain (2385835), R. S. Anand (1716754)   +9 more
core   +1 more source

Spirobifluorene fusion in multiple resonance frameworks enables efficient pure‐red OLEDs with narrowband emission and suppressed efficiency roll‐off

FlexMat, EarlyView.
An orthogonal spirobifluorene‐fusion strategy is introduced for B/N/O‐alternated MR frameworks, enabling improved kRISC (5.46 × 103 s−1), high ΦPL (97%), and narrow‐band pure‐red emission. Vacuum‐evaporated OLEDs incorporating this emitter achieve an EQEmax >40% (FWHM = 36 nm) and exhibit exceptionally low efficiency roll‐off at high luminance ...
Yan‐Yun Jing, Han Wu, Xiaoling Xu, Sijie Xian, Jingsheng Miao, Xiaojun Yin, Chuluo Yang, Xiaosong Cao   +7 more
wiley   +1 more source

Synthesis of 9-Alkylidene-9H-fluorenes by a Novel Palladium-Catalyzed Rearrangement

, 2016
In the presence of a palladium catalyst and NaOAc, aryl iodides react with 1-aryl-1-alkynes to afford 9-alkylidene-9H-fluorenes in good yields. This process appears to involve (1) oxidative addition of the aryl iodide to Pd(0), (2) alkyne insertion, (3 ...
Richard C. Larock (1353099), Qingping Tian (1633456)   +1 more
core   +1 more source

]fluorenes for Solution‐Processed Multilayer Organic Light‐Emitting Diodes

, 2020
The synthesis and application of a series of crosslinkable bis(diphenylamine)‐substituted mixed dihydroindeno[1,2‐b]fluorenes as model systems for the fabrication of solution‐processed, multilayer organic light‐emitting diodes (OLEDs) is described ...
Johanna Paschek, Reggelin, Michael, Paschek, Johanna, Anne Umbach, Schelter, Jürgen, Meerholz, Klaus, Michael Reggelin, Hempe, Matthias, Matthias Hempe, Klaus Meerholz, Jürgen Schelter, Umbach, Anne   +11 more
core   +1 more source

Straightforward Synthesis of Dihydrobenzo[a]fluorenes through Au(I)-Catalyzed Formal [3 + 3] Cycloadditions [PDF]

, 2012
Dihydrobenzo[a]fluorene derivatives have been prepared by a formal intramolecular [3 + 3] cycloaddition of o-alkynylstyrenes bearing a secondary alkyl group at the β-position of the styrene moiety.
García García, Patricia, Sanz Díez, Roberto, Sanjuán Cortázar, Ana María, Rashid, Muhammad A., Fernández Rodríguez, Manuel A.   +4 more
core   +1 more source

Fluorene‐based blue emitters: On the path to electrically pumped organic lasers

FlexMat, EarlyView.
Electrically pumped efficient operation remains unrealized, a major challenge in optoelectronics. Fluorene‐based blue‐emitting semiconductors are promising gain media, thanks to their structural tunability and favorable emission properties. This review summarizes recent advances, highlights their reliability and versatility in lasing, and outlines key ...
Yong Yan, Hao Li, Mengna Yu, Huiyin Wang, Jiangqiang He, Menghan Wu, Quanyou Feng, Linghai Xie   +7 more
wiley   +1 more source

Donor−Acceptor 9-Uncapped Fluorenes and Fluorenones as Stable Blue Light Emitters,

, 2009
The “green emission defect” (GED) produced by fluorenones has significantly retarded the commercial scope of fluorene-based B-OLEDs. In this paper, for the first time, it is demonstrated that the “green light” emitting fluorenones 7 can be converted to ...
Jena, Bijayalaxmi, Jain, Mayank, Verma, Jai K., Kumar, Vijay, Goel, Atul, Anand, R. S., Prakash, Sattey, Chaurasia, Sumit, Dixit, Manish, Manoharan, S. Sundar   +9 more
core   +1 more source

Studies on the Fluorene Derivatives. XI

Journal of Synthetic Organic Chemistry, Japan, 1958
2-Methoxyfluorene in glacial acetic acid is nitrated and the products are separated into 2-methoxy-7-nitrofluorene (mp 218-9°C) and 2-methoxy-3-nitrofluorene (mp 190-1°C) with 54% and 9% yield, respectively.2-Methoxy-7-aminofluorene (mp 189-90°C), 2-methoxy-3-aminofluorene (mp 203-4°C), and 2-methoxy-3-acetaminofluorene (mp 241-2°C) are also ...
Nobuo ISHIKAWA, Mitsuo OKAZAKI
openaire   +2 more sources

Lead‐free halide perovskites for efficient light‐emitting devices

FlexMat, EarlyView.
Overview of Lead‐free metal halide perovskites with different categories and optoelectronic application directions, including solid‐state lighting, light‐emitting diodes, piezoluminescence, flexible electronics, scintillators and CPL emitters. Abstract Lead halide perovskites exhibit promising optoelectronic properties for optoelectronic applications ...
Yueqi Shen, Kefan Meng, Yiqi Zhao, Chaoran Zhou, Jiaye Shu, Di Zhang, Chengqian Cao, Wanxin Chen, Yefeng Zhou, Weihua Ning   +9 more
wiley   +1 more source

Recent advances and prospects for high‐efficiency blue hot exciton organic light‐emitting diodes

FlexMat, EarlyView.
Blue organic light‐emitting diodes (OLEDs) face great challenges in achieving the balance between color purity, device efficiency, and stability. Hot exciton materials offer a solution by rapidly converting non‐emissive triplet excitons into singlet ones through a high‐lying reverse intersystem crossing process.
Xiaoen Shi, Shuyuan Ge, Futong Liu, Ping Lu   +3 more
wiley   +1 more source