Tunable white light emission from Dy3+/Eu3+ doped LaAlO3 nanophosphors via hydrothermal method

• Published in: Materials science & engineering. B, Solid-state materials for advanced technology Solid-state materials for advanced technology, 2021-01, Vol.263, p.114883, Article 114883
• Main Authors: Ankoji, P., Hemalatha Rudramadevi, B.
• Format: Article
• Language: English
• Subjects: CIE; Color; Europium; Excitation; Hydrothermal method; Light emission; Luminescence; Nanophosphors; Optoelectronic devices; Perovskites; Tunable color; White light
• ISSN: 0921-5107; 1873-4944
• DOI: 10.1016/j.mseb.2020.114883

•Synthesis of LaAlO3:Dy3+/Eu3+ nanophosphors by a hydrothermal method.•Structural and photoluminescence properties of nanophosphors were investigated.•TEM images clearly exhibited the particles in nanometer range and polygonal nature.•Emission spectra clearly revealed that the energy transferred from Dy3+ to Eu3+ with Dy3+ and Eu3+ characteristic emission peaks.•The CIE coordinates confirmed that the nanophosphors emitted warm white light. A sequence of Dy3+/Eu3+ co-doped LaAlO3 nanophosphors are synthesized by hydrothermal technique and their phase purity, particle nature and luminescence characteristics are investigated. All the prepared samples possess single-phased perovskite type rhombohedral structure of LaAlO3 and consist of polygonal natured particles with the mean size of 30 nm. Under the excitation with 351 nm, LaAlO3: Dy3+ nanophosphors shown characteristic emission peaks of Dy3+ ion and are positioned at 485, 576 and 665 nm. LaAlO3: 9 mol% Dy3+, y mol% Eu3+ nanophosphors exhibited emission bands of both Dy3+ and Eu3+ ions and are noticed at 485, 576, 590, 620 and 696 nm under 351 nm excitation. It can be perceived that the Dy3+ integrated luminescence intensity is reduced and the average lifetime of Dy3+ is decreased with the enhancing Eu3+ content, which is owing to energy migrates from Dy3+ ion to Eu3+ ion. Moreover, CIE coordinate values of LaAlO3: 9 mol% Dy3+, y mol% Eu3+ nanophosphors are altered from the bluish-white to white light and ultimately to the orange-white light location with increasing the Eu3+ ion content. This nature of color adjustable nanophosphors shows the excellent potential advantages in the fields of white light luminescent materials, optoelectronic devices and color displays.