Two-step thermal quenching of photoluminescence in Zn-doped GaN

hermal quenching of photoluminescence from Er-doped GaN thin films

The green (537 and 558 nm) and near infrared (1.54 mm) photoluminescence (PL) spectra of Er-doped GaN thin films have been investigated as a function of temperature, excitation wavelength, and pump intensity. Thermal quenching measurements showed that the 31 4 2 4 integrated green Er PL intensity ( S / H → I ) remained nearly constant up to 150 K, but decreased at higher temperatures 3 / 2 11 /...

Thermal stability of photoluminescence in Cu-doped Zn-In-S quantum dots for light-emitting diodes.

The photoluminescence (PL) properties of the Cu:Zn-In-S core quantum dots (QDs) and core-shell QDs were systematically investigated by using steady-state and time-resolved PL spectra at temperatures ranging from 80 to 400 K. The effects of the shell structure and the host bandgap on the thermal stability of Cu dopant emissions were studied by measuring the change in the PL intensity and the lif...

Two charge states of dominant acceptor in unintentionally doped GaN: Evidence from photoluminescence study

Photoluminescence of Mg-doped m-plane GaN grown by MOCVD on bulk GaN substrates

Photoluminescence (PL) properties are reported for a set of m-plane GaN films with Mg doping varied from mid 10 18 cm -3 to well above 10 19 cm -3 . The samples were grown with MOCVD at reduced pressure on low defect density m-plane bulk GaN templates. The sharp line near bandgap bound exciton (BE) spectra observed below 50 K, as well as the broader donor-acceptor pair (DAP) PL bands at 2.9 eV ...

PHOTOLUMINESCENCE STUDY OF GaN

Photoluminescence study of undoped, doped GaN grown on (00.1), (11.0), (01.2)Αl 2 O 3 (100), (111)Si, and (00.1)6H—SiC substrates have been conducted. Strong bandedge emissions from all undoped samples and dopant-related emissions from doped samples were observed. Deep-level yellow emissioii centered around 2.2 eV was not observed from undoped GaN grown on 6H-SiC substrate, undoped GaN with opt...