High moisture resistance of an efficient Mn4+-activated red phosphor Cs2NbOF5:Mn4+ for WLEDs | Научно-инновационный портал СФУ

High moisture resistance of an efficient Mn4+-activated red phosphor Cs2NbOF5:Mn4+ for WLEDs

Тип публикации: статья из журнала

Год издания: 2020

Идентификатор DOI: 10.1016/j.cej.2020.126678

Ключевые слова: light-emitting diodes, mn4+, moisture resistance, photoluminescence, self-protection

Аннотация: Mn4+-activated fluoride red phosphors, the most important red phosphors for warm white light emitting diodes (LEDs), usually suffer from inherent poor moisture resistance which is a major obstacle to their long-lasting outdoor applications in a high humidity environment. Surface modification of phosphors by coating with either organic or inorganic shells is an effective way to improve waterproof stability. However, the coating procedure usually has a negative impact on the luminous efficacy due to the increased passivation shell thickness. In this work, Mn4+-activated oxyfluoroniobate (Cs2NbOF5), a highly efficient phosphor with internal quantum efficiency of ca. 82%, has been successfully synthesized and it is interesting to note that Cs2NbOF5:Mn4+ can exhibit remarkably improved waterproof stability even without surface coating compared to well-accepted commercial fluoride red-emitting phosphor, K2SiF6:Mn4+. The results obtained indicate that Nb5+ ions inside red phosphor play a crucial role in improving the water-resistant performance of Mn4+, which provides a new concept for overcoming the downside of their waterproof in humid conditions and maintaining the luminescence efficiency. In the final phase white LEDs with a high luminous efficacy of 174 lm/W (higher than commercial fluoride red phosphors), low correlated color temperature (3164 K) and high color rendering index (Ra = 90 and R9 = 85) have been fabricated using Cs2NbOF5:Mn4+. © 2020 Elsevier B.V.

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Издание

Журнал: Chemical Engineering Journal

Выпуск журнала: Vol. 405

Номера страниц: 126678

ISSN журнала: 13858947

Авторы

  • Zhou J. (School of Marine Sciences/School of Chemistry, Sun Yat-Sen University, Zhuhai 519082, Guangzhou, 510275, China)
  • Chen Y. (School of Marine Sciences/School of Chemistry, Sun Yat-Sen University, Zhuhai 519082, Guangzhou, 510275, China)
  • Jiang C. (School of Marine Sciences/School of Chemistry, Sun Yat-Sen University, Zhuhai 519082, Guangzhou, 510275, China)
  • Milićević B. (School of Marine Sciences/School of Chemistry, Sun Yat-Sen University, Zhuhai 519082, Guangzhou, 510275, China)
  • Molokeev M.S. (Laboratory of Crystal Physics, Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, 660036, Russian Federation, Siberian Federal University, Krasnoyarsk, 660041, Russian Federation, Department of Physics, Far Eastern State Transport University, Khabarovsk, 680021, Russian Federation)
  • Brik M.G. (College of Sciences, Chongqing University of Posts and Telecommunications, Chongqing, 400065, China, Institute of Physics, University of Tartu, W. Ostwald Str. 1, Tartu, 50411, Estonia, Institute of Physics, Jan Dlugosz University, Armii Krajowej 13/15, Czestochowa, PL-42200, Poland)
  • Bobrikov I.A. (Frank Laboratory of Neutron Physics, Joint Institute for Nuclear Research, Dubna, 141980, Russian Federation)
  • Yan J. (Guangdong Institute of Semiconductor Industrial Technology, Guangzhou, 510650, China)
  • Li J. (School of Marine Sciences/School of Chemistry, Sun Yat-Sen University, Zhuhai 519082, Guangzhou, 510275, China)
  • Wu M. (School of Marine Sciences/School of Chemistry, Sun Yat-Sen University, Zhuhai 519082, Guangzhou, 510275, China)

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