The Aim of This Study Is to the Best of One’S Knowledge, This Is the First Time That Blue Light
Emitting Flexible Ac Powder Electroluminescence (Acpel) Devices Have Been Fabricated With Undoped And
Europium Incorporated Znga2o4 As Well As Undoped Cawo4 Phosphors and Their Characteristics Were
Tested. the Materials That Are Directly or Indirectly Used to Advance the Existing Technology or to Develop
New Technologies Are Technologically Important. It Can Be Achieved By Improving Performance, Improving
Activity or Changing the Overall Performance of the Device In Terms of Accuracy, Cost, Handling and Safety
Etc. In the Last Few Years a Major Progress In the Phosphorus Sector Has Been Explored Through The
Introduction In Different Host Matrices of Phosphorus For Solid State Lighting Applications of Transitional
Metal Ions and Trivalent Rare Earth Ions (Lanthanides), the Use of Luminescent Centers (Dopants). Usually,
Most Phosphors Consist of a Host Material That Is Composed of a Family of Sulphides, Phosphates,
Aluminats, Oxides, Molybdates, Tungsten Sulphides, Silicates Etc (Transition Metal Ions and Lanthanides).
The Host Grating Is Usually a Wide-Band Semi-Conductor or Insulator and It Is Suitable For Accommodating
Doping Ions. the Host Compound Also Controls Little of the Luminescent Phosphorus' Physical And
Chemical Behavior, Such As Emission Intensity and Life-Long Properties. In Most Cases, the Concentration
Levels of Dopant Ions or Activator Ions Range from a Few Ppm to 1 ...