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The undoped and transition metal (TM) -doped AIN (AIN:Cu and AIN:Fe) nanorods on silicon substrates were fabricated using a catalysis-free vapor phase method. All the nanorods exhibited high crystalline quality and preferred c-axis orientation. Room-temperature photoluminescence (PL) measurement revealed that undoped AIN nanorods exhibited strong oxygen-related impurity emission at ~3.25 eV. However,...
This paper aims at investigating the effects of the lamp current and power on the electrical behavior, the spectral distribution and the produced luminance. Based on the results observed, the starting transient characteristics can be well understood and the times for entering thermal equilibrium and the steady-state light output can be defined in a more reasonable manner. Experimental evidence shows...
Experiments are conducted to investigate the starting characteristics of metal halide lamps ballasted with a controllable low-frequency square-wave current. Several starting scenarios are examined to learn the different acceleration schemes of the start-up transient. Experimental evidence shows that the starting time of a metal halide lamp can be effectively shortened by increasing the lamp current...
High-frequency operating characteristics of small-wattage metal halide lamps are investigated. Included are the spectral energy, the color temperature, the acoustic resonance, and the luminous efficiency. Two electronic ballasts are built to drive the lamps with the sinusoidal current and the square-wave current, respectively. The experiments are conducted on tested lamps of 70 W and 150 W in a frequency...
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