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    Halogen substitution in zero-dimensional mixed metal halides toward photoluminescence modulation and enhanced quantum yield / M. Z. Li, Y. W. Li, M. S. Molokeev [et al.] // Adv. Opt. Mater. - 2020. - Vol. 8, Is. 16. - Ст. 2000418, DOI 10.1002/adom.202000418. - Cited References: 34. - M.L., Y.L. contributed equaly to this work. This work was supported by the National Natural Science Foundation of China (51961145101, 51972118, and 51722202), Fundamental Research Funds for the Central Universities (FRFTP-18-002C1), the Guangdong Provincial Science &Technology Project (2018A050506004), and the Local Innovative and Research Teams Project of Guangdong Pearl River Talents Program (2017BT01 x 137). This work was also funded by RFBR according to the research project No. 19-52-80003. The work at Jilin University is supported by the National Natural Science Foundation of China (Grant No. 61722403 and 11674121) and Jilin Province Science and Technology Development Program (Grant No. 20190201016JC). Calculations were performed in part at the high performance computing center of Jilin University. . - ISSN 2195-1071
   Перевод заглавия: Замена галогена в смешанных галогенидах металлов с нулевой размерностью для модуляции фотолюминесценции и увеличения квантового выхода

РУБ Materials Science, Multidisciplinary + Optics
Рубрики:
WHITE-LIGHT EMISSION
PEROVSKITES
EXCITONS
Кл.слова (ненормированные):
halogen substitution -- hybrid metal halides -- photoluminescene quantum yield
Аннотация: Zero‐dimensional (0D) organic−inorganic hybrid metal halides haveunprecedented degrees of freedom for structural tunability and photoluminescence modulation. Here, the 0D isomorphic hybrid metal mixed halides (C9NH20)9Pb3Zn2Br19(1−x )Cl19x (x = 0–1) with continuous halogen contents control, exhibiting tunable emission and enhancement of photoluminescence quantum yield (PLQY) are reported. The competitive bromine to chlorine substitution process in (C9NH20)9Pb3Zn2Br19(1−x )Cl19x occurs first in [ZnBr4−x Clx ]2− tetrahedron before the [Pb3Br11−x Clx ]5− trimer. The increasing Cl content in samples from x = 0 to 1 results in an expected blue shift of emission peak from 565 to 516 nm, and meanwhile a strikingly room temperature PL quantum yield increase from 8% to 91%. Combined experimental characterizations and theoretical calculations indicate that the blue shift of interband transition energy is responsible for the emission peak shift. Moreover, with the increasing Cl content, the enhanced electron−phonon interaction and the weakened thermal‐assisted nonradiative recombination result in more efficient radiative transition channels and ultimately enhanced PLQY. The impact of halogen substitution on electronic structures and optical properties in 0D hybrid metal halides is emphasized in this work as a new strategy to promote the future development of new luminescent materials.

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Держатели документа:
Univ Sci & Technol Beijing, Sch Mat Sci & Engn, Beijing Municipal Key Lab New Energy Mat & Techno, Beijing 100083, Peoples R China.
Jilin Univ, Coll Mat Sci & Engn, Key Lab Automobile Mat MOE, State Key Lab Integrated Optoelect, Changchun 130012, Peoples R China.
Fed Res Ctr KSC SB RAS, Kirensky Inst Phys, Lab Crystal Phys, Krasnoyarsk 660036, Russia.
Siberian Fed Univ, Krasnoyarsk 660041, Russia.
Far Eastern State Transport Univ, Dept Phys, Khabarovsk 680021, Russia.
South China Univ Technol, Inst Opt Commun Mat, State Key Lab Luminescent Mat & Devices, Guangzhou 510641, Guangdong, Peoples R China.

Доп.точки доступа:
Li, Mingze; Li, Yawen; Molokeev, M. S.; Молокеев, Максим Сергеевич; Zhao, Jing; Na, Guangren; Zhang, Lijun; Xia, Zhiguo
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