무기형광체 재료의 응용 사례

무기형광체 재료의 응용 사례

무기형광체 재료의 응용 사례.pptx

목차 1.Backgrounds 2.Applications -LED -Plasma Display -Various Phosphors Scintillatior Nanostructured Phosphors Quantum Cutting Phosphors Upconversion Phosphors -Solar Cells 본문 Phosphor (Energy Converter) Inorganic phosphor materials "Classical" inorganic phosphors usually consist of a host lattice with activator ions doped into it in small concentrations, typically a few mole percent or less. Host lattice & Activator ion 1st type : weak interaction (Ln3+) 2nd type: strong interaction ( Mn2+, Eu2+, Ce3+, Pb2+,Sb3+, Ce3+, MoO42-, NbO43-) Activator (+ Sensitizer) Electronic Configuration Eu2+: 1s 22s 22p6 3s23p6 4s23d104p65s 2 4d105p66s2 4f5 5d Host (band absorption )~ semiconductor material The probability for an excited electron to lose energy by generating lattice vibration :1012 to 1013s-1 The probability for light emission is at most 109s-1. At finite temperature, the electron state oscillates around the equilibrium position along the configurational coordinate curve up to the thermal energy of kT. At relatively high temperature, a nonradiative relaxation process the transition probability per unit time, N : By letting W by the luminescence probability, the luminescence efficiency h can by expressed as: Incompletely filled 4 f shell 4 f orbital shielded from surroundings by the filled 5s2 &5p6 orbital small influence of the host lattice to optical transition 키워드 무기, 무기형광체, 사례, 재료, 형광체