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NIIPP АЛ360Б (AL360B) - Fluorescent Green LED |
Shorter wavelengths proved especially difficult to achieve, and after years of failure scientists switched to another approach employing the use of so-called Anti-Stokes phosphors. These are combined with a high power silicon-doped gallium arsenide infrared-emitting diode, whose radiation is up-converted to visible wavelengths by a coating of the phosphor directly on the surface of the die.
The first commercial Anti-Stokes LED is believed to have been the SSL-3, introduced by General Electric around 1968. That employed a single phosphor, believed to be LaF3:Yb,Er with a broad green emission. Similar developments were made by the Scientific Research Institute of Semiconductor Devices in the former USSR, resulting in the АЛ360 device featured here. It existed in two models, the АЛ360А and the АЛ360Б, the latter featuring doubled output. This device is unusual in that shows two emission peaks, in the green and in the red. The addition of the red anti-stokes phosphor has presumably been made to increase luminous flux - these have a quantum efficiency up to 2%, ten times better than the 0.2% of typical green anti-stokes phosphors. Its impact on luminous flux is less significant however, owing to the human eye's higher sensitivity to green wavelengths. The green and red phosphors are suspected to be BaYF5 and Y3OCL7 respectively.
| Manufacturer: | НИИПП (NIIPP) | |
| Lamp Voltage: | <1.70 Volts | |
| Lamp Current: | 10 mA Nominal | 20 mA Max. (80 mA Pulsed) |
| Lamp Power: | 17 mW Nominal | 34 mW Max. |
| Cap Type: | Metal Wires | Ø 0.0175" x 0.1" Pitch |
| Bulb Type: | TO-5 transistor | |
| Bulb Finish: | Clear Glass | |
| Die Chemistry: | GaAs | |
| Luminous Flux: | ||
| Luminous Efficacy: | ||
| Peak Intensity: | 0.6 cd/m2 | |
| Beam Distribution: | approx 10 degrees | to half-peak |
| Wavelength: | 555 nm Peak | 559 nm Dominant |
| Colour Temperature & CRI: | CCT: 5200K | CRI: Ra 30 |
| Chromaticity Co-ordinates: | CCx: 0.351 | CCy: 0.547 |
| Rated Lifetime: | ||
| Burning Position: | Universal | |
| Overall Length: | ||
| Light Centre Length: | ||
| Factory: | Tomsk | Russia |
| Date of Manufacture: | December 1993 | |
| Original / Present Value: | 10 Roubles (2014) | GB £0.127 (2014) |
