A novel red phosphor of Mn4+ ion-doped oxyfluoroniobate BaNbOF5 for warm WLED applications. Issue 37 (10th September 2018)

• Record Type: Journal Article
• Authors: Dong, Xinlong; Pan, Yuexiao; Li, Dong; Lian, Hongzhou; Lin, Jun
• Is Part Of: CrystEngComm. Volume 20:Issue 37(2018)
• Page Start: 5641
• Page End: 5646
• Publication Date: 2018-09-10
• Subjects: Crystals -- Periodicals; Crystal growth -- Periodicals; Crystallography -- Periodicals; Cristaux -- Périodiques; Cristaux -- Croissance -- Périodiques; Cristallographie -- Périodiques; 548
• DOI: 10.1039/c8ce01304g
• Languages: English
• ISSNs: 1466-8033

Abstract

Abstract : A novel red phosphor composed of Mn 4+ -activated oxyfluoroniobate BaNbOF5 was obtained at room temperature in air. The as-prepared phosphor showed a broad and intense absorption in the blue-light region and a bright red luminescence with a color purity of 97.7%. Abstract : A red phosphor composed of Mn 4+ -activated oxyfluoroniobate BaNbOF5 was synthesized from the starting materials BaF2, Nb2 O5, and K2 MnF6 in an HF solution by using a method based on dissolution ion-exchange recrystallization. The BNOF:Mn phosphor particles transformed from micron-sized polyhedrons to rectangular blocks as the reaction temperature was increased from room temperature to 180 °C. The effects of the synthetic parameters, such as the concentration of K2 MnF6 in the reaction system and the reaction temperature, on the luminescence intensity of BNOF:Mn were investigated by acquiring detailed experimental results. The as-prepared BNOF:Mn phosphor displayed a broad and intense absorption in the blue-light region and a bright luminescence in the red-light region with a color purity of 97.7% at the Commission Internationale de l'Eclairage (CIE) chromaticity coordinates of x = 0.594, y = 0.390. The BNOF:Mn phosphor showed superior thermal stability and its activation energy E a was determined to be 0.506 eV. The advantage of the synthetic strategy to obtain BNOF:Mn can be extended to developing oxyfluoroniobates based on Mn 4+ -doped red phosphors, which might have the advantages of both oxides and fluorides.