journal article·2019-06-05

Alcohol-Guided Growth of Two-Dimensional Narrow-Band Red-Emitting K2TiF6:Mn4+ for White-Light-Emitting Diodes

Wenli Zhou, Ren-Hong Wang, Lichang Yin, Jun Chen, Chaochin Su, Xianran Xing, Ru-Shi Liu

ACS Applied Materials & Interfaces· Volume 11· Issue 22
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Abstract

The use of red phosphors with low light-scattering loss could improve the luminous efficacy and color rendering of white-light-emitting diodes (LEDs). Thus, the discovery of such phosphors is highly desired. In this work, high-efficiency two-dimensional red-emitting K2TiF6:Mn4+ (KTFM) were synthesized via an alcohol-assisted coprecipitation route. The synergistic effects of 1-propanol and hydrofluoric acid on the growth of KTFM microsheets (MSs) were studied through the first-principles calculations, which revealed that 1-propanol promoted the growth of KTFM MSs by preferentially adsorbing on the H-terminated K2TiF6 (001) surface. The photoluminescence quantum efficiency (QE) of Mn4+-activated K2TiF6 MSs was highly related to their size and thickness. The morphology-optimal KTFM MSs presented high internal QE (>90%), external QE (>71%), and thermal quenching temperature (102% at 150 °C relative to that at 25 °C). A prototype phosphor-converted LED with KTFM as the red-emitting component showed excellent color rendition (Ra = 91, R9 = 79) and high luminous efficacy (LE = 156 lm/w).
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Research context

OpenAlex topics: Luminescence Properties of Advanced Materials · Ga2O3 and related materials · Perovskite Materials and Applications

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Department of Chemistry, National Taiwan University, Taipei 106, Taiwan

Key Laboratory of Chemical Biology and Traditional Chinese Medicine Research, Ministry of Education, College of Chemistry and Chemical Engineering, Hunan Normal University, Changsha 410081, China

Institute of Organic and Polymeric Materials/Research and Development Center for Smart Textile Technology, National Taipei University of Technology, Taipei 10608, Taiwan

Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China

Department of Physical Chemistry, University of Science and Technology Beijing, Beijing 100083, China

Department of Mechanical Engineering and Graduate, Institute of Manufacturing Technology, National Taipei University of Technology, Taipei 106, Taiwan

Funding

National Natural Science Foundation of China · Ministry of Science and Technology, Taiwan · Scientific Research Fund of Hunan Provincial Education Department · Special Program for Applied Research on Super Computation of the NSFC-Guangdong Joint Fund (second phase)

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