Abstract
A highly intense yellow-emitting phosphorSr2-xBaxTiO4:Eu3+,Gd3+peaking at 593–611 nm was synthesized by the sol-gel method. XRD and SEM show that the samples are single phase and have irregular shape. The excitation wavelength matches well with that of the emission of the blue-light-emitting diode. The emission peaks at 593 and 611 nm are attributed to the transitions from the5D0-7F1and5D0-7F2ofEu3+ions, respectively.Gd3+was used as sensitizer, aiming at increasing the luminous intensity. A certain amount ofSr2+andBa2+is contributed to the intensity of light emission.
Highlights
A light revolution is sweeping all over the world due to its advanced properties such as long life time, low energy consumption, high efficiency, environmental friendliness, and the potential applications in indicators, backlights, automobile head-lights, and general illuminations [1, 2]
WLEDs are fabricated by combining a blue LED chip GaN with yellow-emitting phosphor such as Y3Al5O12:Ce3+ [5]
This type of white light has low color rendering because of the deficiency in red region of the sunlight spectrum. These shortcomings limit its prospects in the field of WLED lighting [6, 7]
Summary
A light revolution is sweeping all over the world due to its advanced properties such as long life time, low energy consumption, high efficiency, environmental friendliness, and the potential applications in indicators, backlights, automobile head-lights, and general illuminations [1, 2]. WLEDs are fabricated by combining a blue LED chip GaN with yellow-emitting phosphor such as Y3Al5O12:Ce3+ [5] This type of white light has low color rendering because of the deficiency in red region of the sunlight spectrum (above 600 nm). Titanate system has excellent properties such as very good physical and chemical stability and being stably present in the epoxy resin or the like silicone encapsulating material; rich resources of titanium lead to the clear price advantage compared with other molybdate and tungstate. It provides favorable conditions for the development of rare earth titanate functional materials. Adjusting the ratio of blue and yellow light, more pure white light can be obtained, and the Sr2−xBaxTiO4:Eu3+, Gd3+ phosphors are expected to be widely used in the WLED field [13, 14]
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