Premium
Luminescence of rare‐earth‐activated Ga‐containing oxides by low‐energy electron excitation
Author(s) -
Yamamoto Hajime,
Suda Yoriko
Publication year - 1998
Publication title -
journal of the society for information display
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.578
H-Index - 52
eISSN - 1938-3657
pISSN - 1071-0922
DOI - 10.1889/1.1985230
Subject(s) - phosphor , thermoluminescence , materials science , anode , analytical chemistry (journal) , conductivity , electron , excitation , electrical resistivity and conductivity , luminescence , luminance , optoelectronics , electrode , optics , chemistry , physics , quantum mechanics , chromatography
— It was previously reported that the thermoluminescence intensity increases with an increase in Ga content in Y 3 (Al 1−x Ga x ) 5 O 12 :Tb 3+ and LaAl 1−x Ga x O 3 :Tm 3+ . This fact suggests that electrical conductivity may be also increased with Ga content, because traps responsible for thermoluminescence can supply free electrons. In this work a correlation is found between the Ga content and electrical conductivity of the above phosphors, which was measured by means of the threshold anode voltage of vacuum‐fluorescent displays (VFDs) using these phosphors, where the anode current or luminance builds up. In a series of Y 3 (Al 1−x Ga x ) 5 O 12 :Tb 3+ , the maximum efficiency is obtained at the composition x = 0.4; it is about 50% higher than the efficiency of ZnGa 2 O 4 :Mn 2+ . Incorporation of In also decreases the threshold voltage, but it decreases the efficiency as well. The traps supplying carriers can be ascribed to oxygen vacancies and/or Ga + .