Light emitting diodes with asymmetric resonance tunnelling
First Claim
1. A light emitting diode (LED) based on a two well system with charge asymmetric resonance tunnelling, comprising first and second coupled wells, one being an active quantum well and the other well being a well which is wide compared with the active quantum well, the wells being coupled via a resonance tunnelling barrier which is transparent for electrons and blocking for holes, wherein the wide well comprises InGaN, the resonance tunnelling barrier comprises GaN and the quantum well comprises InGaN.
1 Assignment
0 Petitions
Accused Products
Abstract
An LED based on a two well system with charge asymmetric resonance tunnelling comprises first and second coupled wells, one being a wide well and the other an active quantum well. The wells are coupled via a resonance tunnelling barrier which is transparent for electrons and blocking for holes.
130 Citations
8 Claims
- 1. A light emitting diode (LED) based on a two well system with charge asymmetric resonance tunnelling, comprising first and second coupled wells, one being an active quantum well and the other well being a well which is wide compared with the active quantum well, the wells being coupled via a resonance tunnelling barrier which is transparent for electrons and blocking for holes, wherein the wide well comprises InGaN, the resonance tunnelling barrier comprises GaN and the quantum well comprises InGaN.
-
7. A light emitting diode (LED) based on a two well system with charge asymmetric resonance tunnelling, comprising first and second coupled wells, one being an active quantum well and the other well being a well which is wide compared with the active quantum well, the wells being coupled via a resonance tunnelling barrier which is transparent for electrons and blocking for holes, wherein the LED is an AlGaInP based LED comprising:
-
an n-type GaAs substrate with the thickness of 100-300 μ
m;
a metallic ohmic contact attached to the substrate;
an n-type GaAs buffer layer with a doping level of 5×
1017-1019 cm−
3 and a thickness of 0.1 to 0.3 μ
m;
an n-cladding layer made of 0.3 to 2 μ
m thick n-type (AlxGa1−
x)0.5In0.5P with 0.5≦
x≦
1 and a doping level of 5×
1017-1020 cm−
3;
an electron emitting layer comprising a simple undoped electron emitting layer made of 0.01 to 0.2 μ
m thick (AlxGa1−
x)0.5In0.5P with 0.2≦
x 0.5 or a multiple quantum well structure made of ≦
1 μ
m thick (AlxGa1−
x)1−
yInyP/(Alx1Ga1−
x)1−
y1Iny1P with 0.5≦
x≦
1, 0.4≦
y≦
0.6 and 0≦
x1≦
0.4, 0≦
y1≦
0.4;
a charge asymmetric resonance tunnelling barrier comprising an ˜
10-100 Å
thick undoped (AlxGa1−
x)0.5In0.5P layer with 0.7≦
x≦
1;
an active well layer comprising either a single quantum well structure made of <
200 Å
thick undoped (AlxGa1−
x)0.5In0.5P with 0≦
x≦
0.4 or a multiple quantum well structure made of ≦
3 μ
m thick (AlxGa1−
x)1−
xInyP/(Alx1Ga1−
x1)1−
y1Iny1P with 0.5≦
x≦
1, 0.4≦
y≦
0.6 and 0≦
x≦
0.4, 0≦
y1 23 0.4;
a 0.3 to 2 μ
m thick hole emitting layer made of p-type (AlxGa1−
x)0.5In0.5P with 0.5≦
x≦
1 and a doping level of 5×
1016 to 5×
1018 cm−
3; and
a ≦
12 μ
m window layer made of p-type InxGa1−
xP with x ≦
0.1 and a doping level 5×
1017 to 5×
1018 cm−
3; and
a metallic ohmic contact deposited on the hole emitting layer.
-
-
8. A light emitting diode (LED) based on a two well system with charge asymmetric resonance tunnelling, comprising first and second coupled wells, one being an active quantum well and the other well being a well which is wide compared with the active quantum well, the wells being coupled via a resonance tunnelling barrier which is transparent for electrons and blocking for holes, wherein the wide well comprises a III-nitride-based semiconductor, the resonance tunnelling barrier comprises a III-nitride-based semiconductor and the quantum well comprises a III-nitride-based semiconductor.
Specification