Electroluminescence of the oxide thin film phosphors Zn2SiO4 and Y2SiO5

Abstract

Mn-activated Zn 2 SiO 4 and Ce-activated Y 2 SiO 5 multilayer thin film electroluminescent ͑EL͒ devices were prepared by rf magnetron sputtering. The EL response of the devices under different voltages, frequencies, and pulse widths, as well as the transferred charge and decay characteristics were studied. The EL device using Zn 2 SiO 4 :Mn as the phosphor layer is shown to achieve a brightness of over 200 cd/m 2 at 400 Hz and a field of 3ϫ10 6 V/cm ͑twice the threshold field͒ and a maximum efficiency of 0.78 lm/W, with a decay time of 0.6 ms. The main characteristics of the oxide phosphors include ͑a͒ strong trailing edge excitation in nonsymmetrical EL devices, ͑b͒ a narrow transferred charge loop, and ͑c͒ a time response sensitive to device structures. Compared with the nonsymmetrical structure, the more symmetrical double-insulated structure is shown to increase the efficiency of the EL device by generating strong EL excitation from both positive and negative voltage pulses.

Combustion Synthesis of the Zn2SiO4:Mn Phosphor

“…The decay time, the width of the CT band and efficiency are modified by co-dopants [7][8][9]. In recent years, Zn 2 SiO 4 : Mn has been found to be suitable for many more applications such as thin film electroluminescent (TFEL) devices [10,11], plasma display panels (PDP) [12,13], medical imaging detector for low-voltage radiography and fluoroscopy [14,15], etc. Synthesis of the phosphor was described in detail as early as 1928 [16].…”

Photoluminescence of Titanium-Doped Zinc Orthosilicate Phosphor Gel Films

“…Among which zinc silicate has been identified as a promising host matrix for many rare-earth elements and transition metal dopant ions, with excellent luminescent properties in the blue, green and red spectral zones [1,2]. Manganese-doped zinc silicate (Zn 2 SiO 4 :Mn), for example, has been widely used as an efficient green phosphor in fluorescent lamps, cathode ray tubes (CRT), and plasma display panels (PDP) [3].…”

Direct Preparation of Y2SiO5Nanocrystallites by a Microwave Hydrothermal Process

“…Y 2 SiO 5 : Tb 3+ is one of the best green emitting cathodoluminescent phosphors [1,2]. Y 2 SiO 5 : Eu 3+ was found to be a promising candidate for coherent time-domain optical memory (CTDOM) applications [3].…”