Light Emitting Diode

/ˌɛl iː ˈdiː/

n. "Semiconductor p-n junction emitting photons via electron-hole recombination unlike incandescent filaments."

LED, short for Light Emitting Diode, forward-biases GaN/AlGaInP junction dropping 2.8-3.4V while radiating 450-470nm blue light—phosphor conversion creates white CCT 2700-6500K as Stokes shift down-converts 30% energy to yellow filling spectrum gap. Contrasts OLED organic emissive layers by leveraging III-V epitaxy achieving 200lm/W efficacy; PWM dimming at 1-10kHz modulates 0-100% without color shift.

Clock

/siːˈkeɪ/

n. "Differential DDR clock pair CK/CK# synchronizing command/address at every rising edge unlike source-synchronous DQS."