Behavior of Phosphors under Low Voltage Cathode Ray Excitation

Abstract

The behavior of phosphors under low voltage (less than 100V) cathode ray excitation is investigated. A phosphor coated on an anode plate is excited by low voltage cathode rays from two line cathodes. Brightness increases as the distance between the anode and the cathodes decreases. Most phosphors used here show high brightness when mixed with conductive materials such as In2O3 or SnO2 . The smaller diameter of In2O3 mixed with Y2O2S:normalEu , the lower added amount of In2O3 necessary for maximum brightness. normalZnS:normalCu,normalAl coated with SnO2 shows maximum brightness when the added amount of SnCl4 is 100 w/o and the sample is fired at 700°C. false(Lax,Lu1−xfalse)InO3:normalEu shows spectrum variations according to the change of x and Eu concentration. The peak wavelength of LaInO3:normalEu changes to longer wavelength when the phosphor is sulfurized into LaInO2S:normalEu , which is a similar phenomenon to that shown by Y2O3:normalEu and sulfurized Y2O2S:normalEu under conventional high voltage cathode ray excitation.

63.3: Enhanced Cathodoluminescence of a Double Layer of two Phosphors

“…Although it is well-known that ZnO:Zn is one of the most efficient LV-phosphor, literature data on the luminous efficacy differ widely [1,[10][11][12][13][14]. In the case of ZnO:Zn at primary electron energies <500eV, the values reported for the luminous efficacy vary by about a factor of eight: 1.3lm/W [12] and 10.7lm/W [14].…”

Low-Voltage Cathodoluminescent Phosphors

“…LxA P where L is the luminance in cd/m 2 , A is the area of the electron beam spot in m 2 , and P is the power of the incident electron beam in watts (W), calculated by multiplying the electron accelerating potential in volts (V) by the current in (12); G (13); N (20); O, U, 5, 9 (14); W (21); YVO 4 :Eu -B, L, Q (13); F (18); P, X, 7, 10 (14); Y 2 O 2 S:Eu -C, J, R (22); D( 12); H, Y (20); K, V (21); M, T, 3, 6, 11 (14); 8 (23); ZnCdS:Ag, In -1 (16); ZnCdS:Ag, In + SnO 2 -2 (17); LaInO 3 :Eu -4 (15); unspecified -E (18). P amperes (A).…”

“…Efficiency of red phosphor powders (lettered squares) and screens (numbered diamonds) as a function of electron accelerating voltage. Y 2 O 3 :Eu -A, I, S(12); G(13); N(20); O, U, 5, 9(14); W(21); YVO 4 :Eu -B, L, Q (13); F(18); P, X, 7, 10 (14); Y 2 O 2 S:Eu -C, J, R(22); D(12); H, Y(20); K, V(21); M, T, 3, 6, 11(14); 8(23); ZnCdS:Ag, In -1(16); ZnCdS:Ag, In + SnO 2 -2(17); LaInO 3 :Eu -4(15); unspecified -E(18).…”