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Saturation of phosphors under low‐voltage excitation
Author(s) -
Stoffers Christian,
Yang Sen,
Jacobsen Stuart M.,
Summers Christopher J.
Publication year - 1996
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 - 10.1889/1.4731188
Subject(s) - phosphor , excitation , saturation (graph theory) , voltage , materials science , rise time , luminescence , atomic physics , optoelectronics , saturation current , analytical chemistry (journal) , optics , physics , chemistry , mathematics , chromatography , combinatorics , quantum mechanics
— Two potential green FED phosphors, Gd 2 O 2 S:Tb and SrGa 2 S 4 : Eu, are examined in detail for performance at 1000‐V excitation energy. Strong saturation effects are observed in Gd 2 O 2 S:Tb and this is explained in terms of ground‐state depletion resulting from the relatively small volume of activators available. A simple two‐level model is used to show that ground‐state depletion can be observed by analyzing the rise time of the luminescence during the “pulse on” excitation time. A comparison is made between the efficiencies of both phosphors as a function of current density, and the article concludes by demonstrating that fast‐decay‐time phosphors such as SrGa 2 S 4 : Eu (1/e = 500 ns) may be essential to enable 100‐cd/m 2 displays at low voltage.