Mn⁴⁺ Activated Deep Red Emitting Perovskite Type Phosphors for Horticulture Lighting

Abstract:

Red emitting Mn⁴⁺ doped oxides are a promising class of materials to improve the colour rendering and luminous efficacy of phosphor-converted light-emitting diodes (pcLEDs). For pcLEDs, the optical properties are crucial w.r.t commercial acceptance. In this work, luminescence spectra and decay curves of Sr₂YNbO₆, Sr₂YTaO₆ and Sr₂LaNbO₆ have been recorded, other Mn⁴⁺ doped phosphors show that quenching occurs through thermally activated crossover between the ⁴T₂ excited state and ⁴A₂ ground state. The quenching temperature can be optimized by designing the host lattice in which Mn⁴⁺ has a high ⁴T₂ state energy. The main target is to study the influence of the above-mentioned host materials on the emission spectra, PL quenching, and quantum yield of the deep red Mn⁴⁺ ion. The present study provides detailed insights into temperature and concentration quenching of Mn⁴⁺ emission and can be used to realize superior narrow-band red Mn⁴⁺ phosphors for horticultural lighting.

• Periodical: Advanced Materials Research (Volume 1167)
• Pages: 57-66
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.1167.57
• Online since: November 2021
• Authors: Muhammad Khurram*, Florian Baur, Thomas Juestel
• Keywords: LEDs, Mn⁴⁺ Luminescence Spectroscopy, Red Phosphor, Reflection Spectroscopy, Time-Dependent Spectroscopy

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