The field control of luminescent characteristic is observed with the three-terminal quantum-confined field-effect light-emitting device at a high temperature of 100–300 K. The modulation scheme caused by the field-induced change in radiative lifetime without change in carrrier density is demonstrated in the practical device. A fast switching of the spontaneous emission intensity free from lifetime limitation is obtained.
A scheme is proposed to study and manipulate band gaps of an entangled coherent system composed of superposition of two atomic Bose-Einstein condensates (BECs) (corresponding to different internal sub-levels and different quantum statistics) and light fields moving in two different optical potentials. The band gaps are found to be a consequence of the periodic dielectric behaviour of the ground state BECs.
Recently, field-induced modulations of optical properties of quantum well (QW) structures are of great interest because of their high speed switching capability. We have proposed a light emitting device1) which makes use of the field effect, instead of the change in carrier density, to result in a fast emission switching free from life time limitation. One of the key points to realize the proposed device was how to design a possible device structure which has the functions of carrier injection and of field control. In this paper, we report the dynamic switching characteristics of the practical field-effect light emitter2), demonstrating a life time free switching.
We have proposed a quantum confined field-effect light emitting devicel)2) to break through the limitation on the switching speed in the conventional light emitting diodes. So far, the field conrrol of luminescent characteristic was demonstrated with the three-terminal field-effect light emitting devices3)4). A high speed switching of emission intensity free from life time limitation was confirmed at low temperatute,-lJgK. However, from the practical viewpoints of the device application, it must be cleared to realize the device operation at room temperature. In this paper, wo report, for the first time, the room temperature operation of the proposed device, demonstrating a life time free switching of emission intensity.
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