We investigate the optical gain properties of InGaN quantum well with different symmetry barriers and asymmetry
barriers based on a self-consistent calculation which solves the Schrodinger equations and Poisson equations
simultaneously. It is found that the AlxInyGa1-x-yN barriers which can eliminate the internal polarized field by adjusting
the component x and y can improve the emission intensity in a large extent compared with other barriers. The internal
polarized field is an important but not the only one factor to affect the emission power, the barrier confinement, the
energy band are all have to be taken into considered. Otherwise, a quantum well which has proper asymmetry barriers
also can obtain better emission efficiency than the well with symmetry barriers.
We propose a new scheme of resonant-cavity (RC) based monolithic white LED, it relaxes the hard requirement of
high internal quantum efficiency of yellow multi-quantum (MQW) and offers an easy way to obtain high luminous
efficacy white light emission. In the proposed white LED, the blue MQW and yellow MQW active layer are embedded in
a resonant-cavity defined by the bottom distributed Bragg reflector(DBR) and top DBR. For a optimal design of
RC-based white LED, the extraction efficiency for yellow light is enhanced, while that for blue light is suppressed, thus
intensity ratio of yellow light in the emitting light is increased, which not only helps to obtain white emission in spite of
the low internal quantum efficiency of yellow light, but also doubles luminous efficacy. The color coordinates and
luminous flux of the emitting light from RC-based white LED are calculated and the performance dependence on
directionality is investigated.
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