TY - JOUR
T1 - White-emission from ZnS:Eu incorporated in AC-driven electroluminescent devices via ultrasonic spray pyrolysis
AU - Rivera-Medina, Martha Judith
AU - Carrillo-Verduzco, Angélica
AU - Rodríguez-Gómez, Arturo
AU - Loi, Maria Antonietta
AU - Alonso-Huitrón, Juan Carlos
N1 - Funding Information:
We want to thank A. Tejeda for X-ray diffraction technical support, and B. Juárez García, and E. A. González Villa for the provision of the Python program for colorimetry analysis. The authors are also grateful to Fis. Roberto Hernández, Dr. Samuel Tehuacanero Cuapa, Dr. Carlos Magaña, and Mtro. Manuel Aguilar Franco for technical assistance in the SEM analysis. This research work received financial support from the project PAPIIT-UNAM , number IN109020 . Authors acknowledge and appreciate the invaluable labor and courage of all those who, during the tragic COVID-19 pandemic, expose their lives to keep doing first necessity activities for the good of all society.
Publisher Copyright:
© 2021 The Authors
PY - 2021/9/15
Y1 - 2021/9/15
N2 - In this work, white-emitting-alternating-current-thin film electroluminescent (w-ACTFEL) devices are demonstrated using europium-doped zinc sulfide (ZnS:Eu) and zirconium oxide (ZrO2) as the emissive and dielectric layers, respectively. These films were deposited by the ultrasonic spray pyrolysis technique on antimony-doped tin oxide glass substrates, forming a standard metal-insulator-semiconductor-insulator-metal (MISIM) architecture. 10 kHz sinusoidal voltages activated the white-EL of the devices. The colorimetric characteristics were investigated for three amplitudes of the applied voltage. The emission of the devices is made up of wide and narrow bands with peaks corresponding to violet, blue, green and red light, which together produce the resulting white light. According to the colorimetric analysis, this white light is close to the standard D65 CIE illuminant with a minimal dominant blue component. The variation in voltage amplitude induces small changes in the visual characteristics of the EL emission. The white-EL emission of these MISIM devices is attributed to the electron-impact excitation and subsequent relaxation of the excited levels of Eu2+ and Eu3+ impurities, and defect levels in the sublayer regions adjacent to the ZrO2–ZnS:Eu interfaces.
AB - In this work, white-emitting-alternating-current-thin film electroluminescent (w-ACTFEL) devices are demonstrated using europium-doped zinc sulfide (ZnS:Eu) and zirconium oxide (ZrO2) as the emissive and dielectric layers, respectively. These films were deposited by the ultrasonic spray pyrolysis technique on antimony-doped tin oxide glass substrates, forming a standard metal-insulator-semiconductor-insulator-metal (MISIM) architecture. 10 kHz sinusoidal voltages activated the white-EL of the devices. The colorimetric characteristics were investigated for three amplitudes of the applied voltage. The emission of the devices is made up of wide and narrow bands with peaks corresponding to violet, blue, green and red light, which together produce the resulting white light. According to the colorimetric analysis, this white light is close to the standard D65 CIE illuminant with a minimal dominant blue component. The variation in voltage amplitude induces small changes in the visual characteristics of the EL emission. The white-EL emission of these MISIM devices is attributed to the electron-impact excitation and subsequent relaxation of the excited levels of Eu2+ and Eu3+ impurities, and defect levels in the sublayer regions adjacent to the ZrO2–ZnS:Eu interfaces.
KW - Colorimetry
KW - Electroluminescence mechanisms
KW - Europium impurities
KW - Interfacial properties
KW - White-electroluminescence
KW - ZnS thin films
KW - ZrO thin films
UR - http://www.scopus.com/inward/record.url?scp=85108404355&partnerID=8YFLogxK
U2 - 10.1016/j.matchemphys.2021.124866
DO - 10.1016/j.matchemphys.2021.124866
M3 - Article
AN - SCOPUS:85108404355
SN - 0254-0584
VL - 270
JO - Materials Chemistry and Physics
JF - Materials Chemistry and Physics
M1 - 124866
ER -