Сибирский федеральный университет

Тип публикации: статья из журнала

Год издания: 2018

Идентификатор DOI: 10.1021/acsami.8b08129

Ключевые слова: 2D-layered perovskite, ion exchange, photoluminescence tuning, Bi3+ emission, white light LEDs

Аннотация: Topological chemical reaction methods are indispensable for fabricating new materials or optimizing their functional properties, which is particularly important for two-dimensional (2D)-layered compounds with versatile structures. Herein, we demonstrate a low-temperature (similar to 350 degrees C) ion exchange approach to prefabricate metastable phosphors ALa(1-x)Ta(2)O(7):xBi(3+)(A = K and Na) with RbLa1-xTa2O7:xBi(3+)serving as precursors. The as-prepared ALa(0.98)Ta(2)O(7):0.02 Bi3+ (A = Rb, K, and Na) share the same Dion-Jacobson type 2D-layered perovskite phase, and photoluminescence analyses show that ALa(0.98)Ta(2)O(7):0.02 Bi3+ (A = Rb, K, and Na) phosphors exhibit broad emission bands peaking at 540, 550, and 510 nm, respectively, which are attributed to the nonradiative transition of Bi3+ from excited state P-3(1) or P-3(0) to ground state S-1(0) The various Bi3+ local environments at the crystallographic sites enable the different distributions of emission and excitation spectra, and the photoluminescence tuning of ALa(0.98)Ta(2)O(7):0.02 Bi3+ (A = Rb, K, and Na) phosphors are realized through alkali metal ion exchange. Notably, the combination of superior trivalent bismuth emission and low-temperature ion exchange synthesis leads to a novel yellow-emitting K(La-0.98 Bi-0.02)Ta2O7 phosphor which is successfully applied in a white LED device based on a commercially available 365 nm LED chip. Our realizable cases of this low-temperature ion exchange strategy could promote exploration into metastable phosphors with intriguing properties.

Журнал: ACS APPLIED MATERIALS & INTERFACES

Выпуск журнала: Vol. 10, Is. 29

Номера страниц: 24648-24655

ISSN журнала: 19448244

Место издания: WASHINGTON

Издатель: AMER CHEMICAL SOC

• Zhou Guojun (Univ Sci & Technol Beijing, Sch Mat Sci & Engn, Beijing Municipal Key Lab New Energy Mat & Techno, Beijing 100083, Peoples R China)
• Jiang Xingxing (Chinese Acad Sci, Tech Inst Phys & Chem, Beijing 100190, Peoples R China)
• Zhao Jing (Univ Sci & Technol Beijing, Sch Mat Sci & Engn, Beijing Municipal Key Lab New Energy Mat & Techno, Beijing 100083, Peoples R China)
• Molokeev Maxim (SB RAS, KSC, Fed Res Ctr, 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)
• Lin Zheshuai (Chinese Acad Sci, Tech Inst Phys & Chem, Beijing 100190, Peoples R China; Univ Chinese Acad Sci, Beijing 100049, Peoples R China)
• Liu Quanlin (Univ Sci & Technol Beijing, Sch Mat Sci & Engn, Beijing Municipal Key Lab New Energy Mat & Techno, Beijing 100083, Peoples R China)
• Xia Zhiguo (Univ Sci & Technol Beijing, Sch Mat Sci & Engn, Beijing Municipal Key Lab New Energy Mat & Techno, Beijing 100083, Peoples R China)

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