Exciton–phonon interaction in Al _0.4 Ga _0.6 N/Al _0.53 Ga _0.47 N multiple quantum wells

Abstract

The exciton-phonon interaction in Al 0.4 Ga 0.6 N/Al 0.53 Ga 0.47 N multiple quantum wells (MQWs) is studied by deepultraviolet time-integrated and time-resolved photoluminescence (PL). Up to four longitudinal-optical (LO) phonon replicas of exciton recombination are observed, indicating the strong coupling of excitons with LO phonons in the MQWs. Moreover, the exciton-phonon coupling strength in the MQWs is quantified by the Huang-Rhys factor, and it keeps almost constant in a temperature range from 10 K to 120 K. This result can be explained in terms of effects of fluctuations in the well thickness in the MQWs and the temperature on the exciton-phonon interaction.

Investigation on the 3-Step Procedure of Nutritional Screening, Evaluation, and GLIM Diagnosis for Elderly Inpatients

“…2 The concepts of deep aging, successful 240 TOPICS IN CLINICAL NUTRITION/JULY-SEPTEMBER 2023 aging, and healthy aging were proposed by Chinese scholars and are popular in Chinese postgraduate textbooks on geriatrics. 2 Nutrition is an important factor that affects healthy aging. Malnutrition, frailty, and sarcopenia are common conditions found in the elderly.…”

“…Healthy aging refers to good physical and mental health and social adaptability, increased overall healthy life expectancy, and a healthy living environment. 2 Successful aging not only emphasizes the health of the elderly, but also fits aging into a broader social background in harmony with the society. 2 The concepts of deep aging, successful 240 TOPICS IN CLINICAL NUTRITION/JULY-SEPTEMBER 2023 aging, and healthy aging were proposed by Chinese scholars and are popular in Chinese postgraduate textbooks on geriatrics.…”

“…These 3 conditions have causal relationships and complex interactions that may hinder healthy aging. 2 The incidence of malnutrition, frailty, and sarcopenia is high in elderly inpatients due to the coexistence of chronic diseases, multiple medications, and acute infections. Inoue et al 3 reported that the malnutrition prevalence rate of the community-dwelling elderly was 12.59% according to the Global Leadership Initiative on Malnutrition (GLIM) diagnosis.…”

“…1 China has the largest elderly population in the world 1 and is entering a stage of "deep aging," referring to a population structure with more than 14% of the population having 65 years or older. 2 How to achieve "healthy aging" and "successful aging" is a major challenge. Healthy aging refers to good physical and mental health and social adaptability, increased overall healthy life expectancy, and a healthy living environment.…”

“…2 Successful aging not only emphasizes the health of the elderly, but also fits aging into a broader social background in harmony with the society. 2 The concepts of deep aging, successful 240 TOPICS IN CLINICAL NUTRITION/JULY-SEPTEMBER 2023 aging, and healthy aging were proposed by Chinese scholars and are popular in Chinese postgraduate textbooks on geriatrics. 2 Nutrition is an important factor that affects healthy aging.…”