목차
1. Efficiencies, Emission Intensity
2. Light Escape Cone
3. Temperature Dependence of Emission Intensity
2. Light Escape Cone
3. Temperature Dependence of Emission Intensity
본문내용
┃ 1. Efficiencies, Emission Intensity
┗━━━━━━━━━━─────────…
1. Internal Quantum Efficiency
# of photons emitted fromactive/sec Pint/(hv)
ηint = ───────────────────── = ───────
# of electrons injected into LED/sec I/e
2. Light Extraction Efficiency
# of photons emitted into free space/sec P/(hv)
ηint = ──────────────────────── = ───────
# of photons emitted from active/sec Pint(hv)
3. External Quantum Efficiency
P(hv)
ηext = ηint ηextraction = ───────
I/e
4. The Power Efficiency
P
ηpower = ─────
IV
┃ 1. Efficiencies, Emission Intensity
┗━━━━━━━━━━─────────…
5. Emission Intensity
Emission Intensity I(E)는, Joint density of state ρ(E)와 Distribution of carriers fb(E) (which is given by Boltzmann distribution)에 비례.
1 2m³/²
ρ(E) = ───── (────) ·√E - Eg ρ(E) ∝ √E - Eg
2π h²
fb(E) = e‾e/kt
∴ I(E) ∝ √E - Eg·e‾e/kt
≪ 그 래 프 ≫
그림 1.1 LED의 Theoretical emission spectrum.
LED의 Luminescence intensity를 Energy에 대해 그려보면 왼쪽 그림 1.1과 같다.
Maximum emission intensity는
1
E = Eg + ────kT
2
Emission의 Full-width at half-maximum(FWHM)은,
1.8kTλ²
ΔE =1.8kT, λ = ─────────
hc
┗━━━━━━━━━━─────────…
1. Internal Quantum Efficiency
# of photons emitted fromactive/sec Pint/(hv)
ηint = ───────────────────── = ───────
# of electrons injected into LED/sec I/e
2. Light Extraction Efficiency
# of photons emitted into free space/sec P/(hv)
ηint = ──────────────────────── = ───────
# of photons emitted from active/sec Pint(hv)
3. External Quantum Efficiency
P(hv)
ηext = ηint ηextraction = ───────
I/e
4. The Power Efficiency
P
ηpower = ─────
IV
┃ 1. Efficiencies, Emission Intensity
┗━━━━━━━━━━─────────…
5. Emission Intensity
Emission Intensity I(E)는, Joint density of state ρ(E)와 Distribution of carriers fb(E) (which is given by Boltzmann distribution)에 비례.
1 2m³/²
ρ(E) = ───── (────) ·√E - Eg ρ(E) ∝ √E - Eg
2π h²
fb(E) = e‾e/kt
∴ I(E) ∝ √E - Eg·e‾e/kt
≪ 그 래 프 ≫
그림 1.1 LED의 Theoretical emission spectrum.
LED의 Luminescence intensity를 Energy에 대해 그려보면 왼쪽 그림 1.1과 같다.
Maximum emission intensity는
1
E = Eg + ────kT
2
Emission의 Full-width at half-maximum(FWHM)은,
1.8kTλ²
ΔE =1.8kT, λ = ─────────
hc
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