Green LED

FIGURE 6.16 Effect of surfactant type on the microchip separation of 2 mg/L TNT, 1 mg/L TNB, and 2 mg/L tetryl. The separation buffer contained MeCN/MeOH (87.5/12.5 ([v/v])), 2.5 mM NaOH, and with (a) no surfactant, (b) 0.5 mM CTAB, (c) 1.0 mM SDS. Applied separation field strength, 506 V/cm, using a 1-s floating injection. Colorimetric detection was achieved using a green LED source (505 nm) [622]. Reprinted with permission from Elsevier Science. 

Fig. 3. Photoresponse characteristics for photoconductive sensor. The incident light comes from GaP green LEDs modulated at 500 Hz. Horizontal scale is 0.5 msec/division. [From Motosugi et al. (1981).]...

Fig. 9. Spectral response for a-Si H photodiode using Si3N4 and p-a-Si H blocking layers (solid curve). The emission intensity spectrum of the yellow-green LED is also shown (dotted curve). The applied voltage for the photodiode is 5 V. [From S. Kaneko el at., Amorphous Si H contact linear image sensor with Si3N4 blocking laye r. Technical Digest—International Electron Device Meeting. Copyright 1982 IEEE.]...

Fig. 10. Photoresponse characteristics of a-Si H photodiode using Si3N4 and p-a-Si H blocking layers. Upper wave form is the photoresponse. Lower wave form is the LED driving pulse. A yellow-green LED (35 lux) modulated by 500 Hz is used. Voltage applied to the photodiode is 5 V. Horizontal scale is 0.5 msec/division and vertical scale is 5 mV/division.

The detection range of the particular capacitive sensors that we used is about 0 to 20 mm. They have a sensitivity adjustment with red and green LED indicators. When the normally-open unit is powered up at around 12 volts, the green LED lights up indicating a power on" state. The red LED remains off. When the target material is detected, the red LED is activated and both the red and green LED are lit. 

Figure 8F-3 Optical comparator, (a) An optical fiber that splits into two branches carries light from a light-emitting diode (LED) through sample and reference wells in a microtiter plate holder. In the comparison mode, a standard containing the threshold level of analyte (aflatoxin) is placed in one of the reference well holders. The samples containing unknown amounts of the analyte are placed in the sample well holder. If the sample contains more aflatoxin than the standard (b), the sample well absorbs less light at 650 nm than the reference well. An electronic circuit lights a red LED to indicate a dangerous amount of aflatoxin. If the sample contains less aflatoxin than the standard (c), a green LED is lit.

High brightness blue and green LEDs based on group-III nitride alloys (e.g. InGaN). 

Nitrite Tap, rain, aquarium waters Ci8-bonded silica end-capped material UV—Vis (diffuse reflectance green LED) 0.46 ng mL1 Flow injection system SPE at the detection unit sandwich optrode [504]... 

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