Low temperature spectroscopic properties of divalent bismuth doped Ba2P2O7 for white light LEDs

Li L, Peng M, Wondraczek L (2017)

Publication Type: Journal article

Publication year: 2017

Journal

Science of Advanced Materials

Book Volume: 9

Pages Range: 490-494

Journal Issue: 3-4

DOI: 10.1166/sam.2017.2327

Abstract

For application in white light LEDs, the temperature-dependence of photoluminescence (PL) is an essential property of a phosphor. For divalent bismuth doped Ba2P2O7, this has not yet been reported, although this class of materials exhibits very interesting spectroscopic properties as a red-emitting phosphors for near-UV (NUV) to blue excitation. This work examines the low temperature spectroscopic properties of Bi2+ doped Ba2P2O7. We report the resistance of luminescence to thermal quenching in the low-to-ambient temperature range. That is, for NUV excitation at ~386 nm, the emission at 300 K retains an 83% of the intensity observed at 10 K. At the same time, emission lifetime decreases only slightly. The latter is related to the gradually enhanced interaction between Bi2+ and local crystal field at rising temperature, which manifests in the disappearing phonon side band of 2P1/2 →2P3/2 and the increased splitting of 2P3/2 (1) and 2P3/2 (2) in the excitation spectrum. Static and dynamic PL spectra reveal two types of Bi2+ emission centers in the compound, consistent with crystallographic data, where two distinct Ba-sites are available for hosting Bi2+. From dielectric chemical bond theory, we obtained a mean bond covalency of 0.1025 for Ba(1)-O and 0.1358 for Ba(2)-O. When substituting Bi2+ (1) and Bi2+ (2) for Ba(1) and Ba(2), they also exhibit distinct emission behavior, i.e., with emission band maxima at 716 and 733 nm, respectively.

Involved external institutions

South China University of Technology (SCUT) / 华南理工大学 CN China (CN)

How to cite

APA:

Li, L., Peng, M., & Wondraczek, L. (2017). Low temperature spectroscopic properties of divalent bismuth doped Ba2P2O7 for white light LEDs. Science of Advanced Materials, 9(3-4), 490-494. https://dx.doi.org/10.1166/sam.2017.2327

MLA:

Li, Liyi, Mingying Peng, and Lothar Wondraczek. "Low temperature spectroscopic properties of divalent bismuth doped Ba2P2O7 for white light LEDs." Science of Advanced Materials 9.3-4 (2017): 490-494.

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